Sleep and Dreaming Why Can't I Sleep? Causes of Insomnia and What to Do to Get More Rest By Michelle Ullman Michelle Ullman Michelle Ullman has written hundreds of articles on home decor since 2011. She's a self-taught decor expert who contributes to several publications. Learn about our editorial process Updated on September 26, 2022 Medically reviewed Verywell Mind articles are reviewed by board-certified physicians and mental healthcare professionals. Medical Reviewers confirm the content is thorough and accurate, reflecting the latest evidence-based research. Content is reviewed before publication and upon substantial updates. Learn more. by Sanja Jelic, MD Medically reviewed by Sanja Jelic, MD Sanja Jelic, MD, is board-certified in sleep medicine, critical care medicine, pulmonary disease, and internal medicine. Learn about our Medical Review Board Print PhotoAlto / Frederic Cirou / Getty Images Table of Contents View All Table of Contents Signs of Trouble Sleeping Reasons You Can't Sleep Impact of Poor Sleep What to Do If You Can't Sleep Frequently Asked Questions Do you often find yourself asking "Why can't I sleep?" or "Why am I more tired when I wake up than when I went to bed?" There are many potential reasons why someone may be having trouble sleeping. Each one can make a good night’s rest more elusive than half-remembered dreams. If you regularly have a tough time falling or staying asleep, chances are the cause is either something you’re doing (like drinking coffee late in the day) or something you’re not doing (like getting rid of the stress that keeps you awake). Fortunately, there are a number of steps you can take to turn things around. Press Play for Advice On Getting Better Sleep Hosted by Editor-in-Chief and therapist Amy Morin, LCSW, this episode of The Verywell Mind Podcast, featuring news anchor Diane Macedo, shares the strategies she used to getter better quality sleep. Click below to listen now. Subscribe Now: Apple Podcasts / Spotify / Google Podcasts Signs of Sleep Problems There are some common signs that you are having trouble sleeping, many of which show up during the day. You may notice: Difficulty concentrating Irritability Lack of energy Mood changes Slowed thinking Poor attention span Poor memory Trouble making decisions If you can't sleep at night, you might also find that you feel groggy and drowsy most of the next day. You may even drift off during the daytime or consume excessive amounts of caffeine to try to stay awake. Why Can't I Sleep? When you say, "I can't sleep," it might mean that you are unable to fall asleep, but it can also mean that you struggle to stay asleep. There are many different factors that might be contributing to trouble with sleep. Lifestyle choices, sleep habits, stress, and medical conditions can all play a role. Alcohol A single glass of alcohol before bedtime may not interfere with your ability to fall asleep, but indulge in much more and sleep can become impaired. This is because alcohol interferes with the sleep cycle, especially the REM sleep that includes dreaming. You may not realize this since the initial effect of drinking alcohol is relaxation. This can help you drop off to sleep quickly after imbibing. But your rest will be fragmented and unrefreshing. This effect is even more prevalent with people with high alcohol use as it often goes hand-in-hand with insomnia. If you drink a lot of alcohol at night, you’re also more likely to wake up mid-sleep to use the bathroom, which can reduce your sleep quality. Anxiety Sleep and anxiety are closely connected. If you have trouble sleeping, your anxiety might increase, and if you have high anxiety, you may have trouble sleeping. In fact, sleep disruption can co-occur with almost all mental health conditions. Research shows that the type of sleep disruption varies based on anxiety type. People with state anxiety (anxiety due to a current situation) typically have more trouble falling asleep. People with trait anxiety (a personality that is more anxious) often have more trouble staying asleep. How to Sleep Better When You Have Anxiety Poor Sleep Habits Sleep habits, such as staying up too late and having an irregular sleep schedule, can play a part in poor sleep. Napping later in the day can lead to trouble sleeping as well. Along with trouble falling or staying asleep, poor sleep habits can also negatively affect mental health. Studies have connected poor sleep hygiene with poorer mental well-being. Sharing Your Bed Sharing your bed, whether with a human or four-legged friend, greatly reduces sleep quality—especially if your partner snores, crowds you, hogs the covers, or otherwise makes you uncomfortable. You and your human partner might also have different preferred sleeping conditions (such as temperature, light, and noise level). Sharing a bed with an infant can also lead to more fragmented sleep for the parent and more night wakings for the child. Sleeping in an adult's bed can also be dangerous for the baby, potentially leading to asphyxia or suffocation. The American Academy of Pediatrics recommends that babies always sleep in their own crib. Poor Sleep Environment Many sleep experts recommend keeping your bedroom at 60 to 67 degrees Fahrenheit at night. But many people like to cut energy costs by turning the thermostat down to the freezing zone during the winter and switching the AC off during the summer. Both of these extremes hijack your trip to the land of Nod, however. Your body needs to cool slightly at night for the most refreshing sleep, which is impossible in an overly heated bedroom. A too-cold room, on the other hand, will wake you up. Caffeine You know a bedtime cup of coffee is a bad idea, but did you know that the half-life of caffeine is three to five hours? That means only half the dose is eliminated during that time, leaving the remaining half to linger in your body. That’s why a late afternoon cup of joe can disrupt your sleep later that night. Caffeine has been associated with having a tougher time getting sleep, less total time asleep, and worsened perceived quality—even more so in older adults as this demographic tends to be more sensitive to this substance. Stress If "I can't sleep" is followed by "I'm so stressed," you're not alone. About 43% of American adults say that stress has kept them up at night at least once in the last month. During the day, the activities of life tend to distract you, but once you settle yourself into bed, your mind is free to roam. For most people, it’s not the good aspects of their lives that their mind chooses to focus on, but rather, the negatives. This can keep them from getting a good night's sleep. Exercise A casual around-the-block stroll with your dog in the late evening is fine (especially if it shifts your pet's wake-up time closer to your own). But research has found that a heart-pumping, sweat-dripping cardio workout within one hour of bedtime is too much. Your body temperature and heart rate naturally drop as you fall asleep. Exercise raises those two body functions and stimulates your entire nervous system, making it tough to snooze. Diet Is your typical bedtime snack a slice (or two) of pizza or a bag of chips? If so, don’t be surprised when you’re lying awake staring at your ceiling. A large amount of fat or protein right before bedtime, or a spicy meal, can send your digestive system into overdrive, making it difficult to sleep and potentially giving you heartburn. Hunger pains can wake you up as well, as can precipitous blood sugar drops during the night. Medications Do you take any medications? If so, this may be the reason why you can't sleep. Drug-induced insomnia can be caused by a variety of prescription medications, including medicines for: Cardiovascular disease Asthma Psychiatric disorders Cancer Hypothyroidism Smoking cessation Screen Time Light exposure at bedtime impairs your quality of sleep, whether it’s coming from your bed partner’s reading lamp, the alarm clock display, or the street light outside your window. Light emitted from electronic devices can have the same effect, making this an issue if you like to watch television or use your smartphone right before bed. Studies have connected longer screen times with a harder time falling asleep, shorter sleep durations, lower sleep efficiency, and worsened sleep quality. It is important to note that other factors—including sleep disorders and depression—can also make sleep difficult. If you suspect that a medical or mental health condition is contributing to your poor sleep, talk to a healthcare provider. Work Schedule Working an early or late shift can disrupt your circadian rhythm, particularly if those shifts vary. Likewise, working long hours at a stressful job can cause anxiety that leaves you staring at your bedroom ceiling. Travel Jet lag confuses your body and mind because it jolts you out of your usual sleep patterns. Similarly, sleeping in an unfamiliar environment can be difficult. Mental Health Issues Insomnia sometimes signals a mental health disorder, such as depression. You might have difficulty falling or staying asleep, sleep too much, or sleep at times unusual for you. Additionally, certain medications prescribed for mental health (e.g., fluoxetine, venlafaxine) can have energizing effects that disrupt sleep. Impact of Poor Sleep Sleep deprivation can have a wide range of negative health effects. Notable physical and mental health consequences of not getting enough sleep include: Anxiety Bipolar disorder Cardiovascular disease Depression High blood pressure Hormone imbalances Obesity Type 2 diabetes Weakened immune system In addition to these health problems, lack of sleep is also connected to an overall decrease in quality of life and a greater risk of death. If you regularly find yourself wondering why you can't sleep, it is important to get to the bottom of the problem and take steps to start improving your sleep quality. Why We Sleep What Should I Do If I Can't Sleep? When I can't sleep, there are some important steps that I take to figure out what's wrong and find solutions. Everyone is unique, however, so what works for you might be different than what works for someone else. Work to alleviate some of the sleep-stealers that are affecting your rest. These strategies can improve the amount and quality of sleep that you get each night: Limit alcohol use, especially in the evening. Give your pets beds of their own, encourage your snoring partner to sleep on their side, and use a white-noise machine to block out sound. Adjust your thermostat to avoid being too hot or too cold. If that's not possible, wear thick socks and use cozy blankets during cold snaps and turn on a fan in the summer. Turn off electronics at least an hour before bedtime. Hang blackout shades or curtains in your bedroom and close the door to shut out the light. Although caffeine’s effects depend on your tolerance, the dose, and your age, it is best to keep your consumption below 400 mg per day and stay away from caffeine sources within six hours of bedtime. If you're struggling with stress, try a daily meditation practice. You don’t need to be an expert yogi or spend hours sitting on a mat. Even 10 minutes a day is beneficial. Schedule your workout for the morning or hit the gym during your lunch hour. If you do exercise at night, don't do your workout within an hour of bedtime. Have a small snack before hitting the hay that is heavier on complex carbs and lighter on protein (but includes both). Good choices include a small bowl of whole-grain cereal and milk, a slice of deli turkey wrapped around a celery stick, or a piece of fruit spread with peanut butter. A Word From Verywell "Why can't I sleep?" It's a question that people often face if they find themselves lying awake at night or exhausted the following day. Understanding some of the common causes of poor sleep is often the first step toward addressing the problem. The first thing to do is assess and address any lifestyle factors that might be interfering with a good night's rest. If you don't find any relief after making these changes, talk to a healthcare provider. They can help get to the bottom of your sleep difficulties and find the appropriate treatment so you can get the rest you need. I Can't Wake Up: What It Means for Your Mental Health Frequently Asked Questions Why can't I sleep even when I'm tired? Some of the most common reasons for insomnia—even when you're tired—include being under a lot of stress, having an irregular sleeping schedule or poor sleep habits, mental health issues, physical illness, medications, and sleep disorders.If you're having trouble sleeping, talk to a healthcare provider. They can help hone in on the reason why you're having trouble sleeping as well as provide some guidance for getting a better night's rest. Learn More: Reasons You're Not Sleeping Well Why can't I sleep through the night? If you wake up during the night, this could be due to growing older, a medication you're taking, your lifestyle (such as drinking alcohol before bedtime or napping a lot), or an underlying condition.Try correcting poor sleep habits and see if your sleep improves. If it doesn't, a healthcare provider can help determine the cause of your sleep issues. Why can't I sleep on my back? You might find sleeping on your back uncomfortable if you have back pain or are used to other sleeping positions. If you'd like to sleep on your back, try placing a pillow under your knees and/or lower back. This should help.However, back sleeping isn't recommended for everyone, such as those who are pregnant, those with obstructive sleep apnea, chronic snorers, or people with heartburn. Why can't I fall asleep? Trouble falling asleep can be caused by having a lot on your mind, a bed partner who snores, late-day naps, or spending time on your phone or watching television right before bed. An irregular sleep schedule may also make it harder to fall asleep. Studies have also connected certain health conditions with sleep onset problems, such as attention-deficit hyperactivity disorder (ADHD). Why can't I go back to sleep? If you wake up in the middle of the night and find it hard to go back to sleep, it's possible that your inability to return to rest is due to watching the clock or thinking about things that tense you up.If you are a light sleeper, you might also find it difficult to return to sleep after hearing a noise, such as having a notification go off on the cellphone by your bed. An inability to turn your mind off once it's awakened may make it hard to let your troubles go long enough to drift off to sleep. 27 Sources Verywell Mind uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy. Sleep Foundation. Sleep deprivation. Colrain I, Nicholas C, Baker F. Alcohol and the sleeping brain. Handb Clin Neurol. 2014;125:415-31. doi:10.1016/B978-0-444-62619-6.00024-0 Anxiety & Depression Association of America. Sleep disorders. Horvath A, Montana X, Lanquart JP, et al. Effects of state and trait anxiety on sleep structure: A polysomnographic study in 1083 subjects. Psychiat Res. 2016;244:279-83. doi:10.1016/j.psychres.2016.03.001 National Institute on Aging. A good night's sleep. Peach H, Gaultney J, Gray D. Sleep hygiene and sleep quality as predictors of positive and negative dimensions of mental health in college students. Cogent Psychol. 2016;3(1):1168768. doi:10.1080/23311908.2016.1168768 Volkovich E, Ben-Zion H, Karny D, Meiri G, Tikotzky L. Sleep patterns of co-sleeping and solitary sleeping infants and mothers: a longitudinal study. Sleep Med. 2015;16(11):1305-1312. doi:10.1016/j.sleep.2015.08.016 American Academy of Pediatrics. How to keep your sleeping baby safe: AAP policy explained. Sleep Foundation. The best temperature for sleep. Institute of Medicine (US) Committee on Military Nutrition Research. Caffeine for the sustainment of mental task performance: Formulations for military operations. Clark I, Landolt H. Coffee, caffeine, and sleep: A systematic review of epidemiological studies and randomized controlled trials. Sleep Med Rev. 2017;31:70-8. doi:10.1016/j.smrv.2016.01.006 American Psychological Association. Stress and sleep. Stutz J, Eiholzer R, Spengler C. Effects of evening exercise on sleep in healthy participants: A systematic review and meta-analysis. Sports Med. 2018;49:269-87. doi:10.1007/s40279-018-1015-0 Johns Hopkins Medicine. Better sleep: 3 simple diet tweaks. Do D. Trends in the use of medications with insomnia side effects and the implications for insomnia among US adults. J Sleep Res. 2020;29(4):e13075. doi:10.1111/jsr.13075 Christensen M, Bettencourt L, Kaye L, et al. Direct measurements of smartphone screen-time: Relationships with demographics and sleep. PLoS One. 2016. doi:10.1371/journal.pone.0165331 Fang H, Tu S, Sheng J, Shao A. Depression in sleep disturbance: A review on a bidirectional relationship, mechanisms and treatment. J Cell Mol Med. 2019;23(4):2324-2332. doi:10.1111/jcmm.14170 Wichniak A, Wierzbicka A, Walęcka M, Jernajczyk W. Effects of antidepressants on sleep. Curr Psychiatry Rep. 2017;19(9):63. doi:10.1007/s11920-017-0816-4 Institute of Medicine (US) Committee on Sleep Medicine and Research. Sleep disorders and sleep deprivation: An unmet public health problem. Centers for Disease Control and Prevention. How does sleep affect your heart health?. Kim TW, Jeong JH, Hong SC. The impact of sleep and circadian disturbance on hormones and metabolism. Int J Endocrinol. 2015;2015:591729. doi:10.1155/2015/591729 Drae C, Roehrs T, Shambroom J, Roth T. Caffeine effects on sleep taken 0, 3, or 6 hours before going to bed. J Clin Sleep Med. 2013;9(11). doi:10.5664/jcsm.2170 Seppala E, Hutcherson C, Nguyen D, Doty J, Gross J. Loving-kindness meditation: a tool to improve healthcare provider compassion, resilience, and patient care. J Compass Health Care. 2014;1(5). doi:10.1186/s40639-014-0005-9 Sleep Foundation. What causes insomnia? Harvard Health Publishing. Top 4 reasons why you're not sleeping through the night. Sleep Foundation. How to sleep on your back. Gruber R, Fontil L, Bergmame L, et al. Contributions of circadian tendencies and behavioral problems to sleep onset problems of children with ADHD. BMC Psychiat. 2012;12:212. doi:10.1186/1471-244X-12-212 See Our Editorial Process Meet Our Review Board Share Feedback Was this page helpful? Thanks for your feedback! What is your feedback? Other Helpful Report an Error Submit Speak to a Therapist Online Advertiser Disclosure × The offers that appear in this table are from partnerships from which Verywell Mind receives compensation.