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How to Sleep Better: Evidence-Based Habits That Work
To sleep better, most adults should aim for at least 7 hours a night on a regular schedule, keep the same wake time every day, and cut caffeine, alcohol, and screens in the hours before bed. If poor sleep lasts for months despite good habits, a structured treatment called CBT-I is the recommended first step, not sleeping pills.
Sleep is one of the cheapest investments in your Physical Wealth, and one of the easiest to neglect. Here’s what the evidence actually supports.
How much sleep do adults need?
The American Academy of Sleep Medicine and the Sleep Research Society reviewed the research and concluded that adults should sleep 7 or more hours per night on a regular basis. The CDC uses the same benchmark. Regularly sleeping less than that is linked with weight gain, diabetes, high blood pressure, heart disease, stroke, and depression.
Many people fall short. CDC survey data show that roughly a third of U.S. adults don’t get enough sleep, and in 2022 the share ranged from about 30% of adults in Vermont to 46% in Hawaii.
Start with a fixed wake time
The single most useful habit is going to bed and getting up at about the same time every day, including weekends. A consistent schedule keeps your body clock steady, which makes it easier to feel sleepy at night and alert in the morning.
Work backwards from your alarm. If you need to be up at 6:30 a.m. and it usually takes you 20 minutes to fall asleep, 7 hours of sleep means lights out by about 11:10 p.m. Seven and a half hours means about 10:40 p.m.
Sleep habits with good evidence behind them
- Protect the last hour. Use it for quiet time. Avoid intense exercise and bright light from TVs, laptops, and phones.
- Keep the bedroom dark, quiet, and cool. Small fixes like blackout curtains or earplugs can help.
- Avoid heavy meals and alcohol close to bedtime. Alcohol may make you drowsy at first but tends to fragment sleep later in the night.
- Skip nicotine in the evening. Like caffeine, it’s a stimulant.
- Move during the day. Regular physical activity is linked with better sleep; just leave a gap before bed if your workouts are intense.
The caffeine math
Caffeine has an average half-life of about 5 hours, though it varies from roughly 1.5 to 9.5 hours from person to person. Half-life means the time it takes your body to clear half of it.
Say you drink a coffee with about 200 mg of caffeine at 3 p.m. By 8 p.m. you may still have around 100 mg in your system, and around 50 mg at 1 a.m. That’s why an afternoon coffee can quietly shorten your night even if you fall asleep fine. Moving your last caffeinated drink to late morning or early afternoon is an easy experiment.
If you have insomnia: CBT-I comes first
Trouble falling or staying asleep that lasts for months is called chronic insomnia. The American College of Physicians recommends cognitive behavioral therapy for insomnia (CBT-I) as the initial treatment for adults, ahead of medication.
CBT-I is a structured program, usually over several weeks, that combines:
- Sleep restriction: temporarily limiting time in bed so sleep becomes deeper and more consistent.
- Stimulus control: using the bed only for sleep, and getting up if you can’t sleep.
- Cognitive work: changing anxious beliefs about sleep that keep you awake.
- Sleep hygiene: the habits above.
It’s offered by sleep specialists, some therapists, and increasingly through digital programs. Ask your doctor what’s available to you.
When to see a doctor
Good habits can’t fix a sleep disorder. Talk to a clinician if you notice:
- Loud, frequent snoring, pauses in breathing, or gasping during sleep (often noticed by a partner). These can be signs of sleep apnea, which is treatable.
- Heavy daytime sleepiness even after what should be enough sleep, especially if you nod off while driving.
- Insomnia lasting more than a few weeks, or sleep problems alongside low mood or anxiety.
- An urge to move your legs at night, or unusual behaviors during sleep.
Sleep and the rest of your wealth
Sleep sits underneath almost every other dimension. Short sleep makes stress harder to manage (Mental Wealth), makes you less patient with people (Social Wealth), and erodes focus at work. If you’re short on sleep because work keeps spilling into your evenings, read Recognising and Recovering From Burnout. To see where sleep fits in your overall health picture, take the free Physical assessment or read the Physical Wealth guide.
Common questions
How many hours of sleep do adults need?
The American Academy of Sleep Medicine, the Sleep Research Society, and the CDC say adults need at least 7 hours of sleep per night on a regular basis. Individual needs vary somewhat with genetics, health, and age.
How long before bed should I stop drinking caffeine?
Caffeine has an average half-life of about 5 hours, so a meaningful amount can remain in your body 6 to 10 hours later. Many people sleep better when they stop caffeine by early afternoon.
What is the best treatment for chronic insomnia?
The American College of Physicians recommends cognitive behavioral therapy for insomnia (CBT-I) as the first-line treatment for adults with chronic insomnia, with medication considered only if CBT-I alone doesn’t work.
Is loud snoring a sign of sleep apnea?
It can be, especially alongside pauses in breathing, gasping, or heavy daytime sleepiness. Not everyone who snores has sleep apnea, but these signs are worth raising with a doctor.
Related guides
Sources
- AASM and SRS publish new sleep duration consensus statement — American Academy of Sleep Medicine
- FastStats: Sleep in Adults — Centers for Disease Control and Prevention
- Sleep Deprivation and Deficiency - Healthy Sleep Habits — National Heart, Lung, and Blood Institute
- ACP Recommends Cognitive Behavioral Therapy as Initial Treatment for Chronic Insomnia — American College of Physicians
- Caffeine Toxicity (StatPearls) — National Library of Medicine, NCBI Bookshelf
This guide is for informational and educational purposes only. It is not financial, medical, legal, or tax advice. Consult a qualified professional for guidance specific to your situation.
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