For most adults, the best time to go to bed is between 10:00 and 11:00 p.m. That window lines up with the lowest risk of heart disease and gives you enough time to get seven or more hours of sleep before a typical morning alarm. But the “right” bedtime also depends on your age, your wake-up time, and how long you actually need to sleep.
Why 10:00 to 11:00 p.m. Stands Out
A large study of middle-aged and older adults tracked bedtime habits against heart disease outcomes and found that people who fell asleep between 10:01 and 11:00 p.m. had the lowest cardiovascular risk. Going to bed before 9:00 p.m. raised the risk by about 10 percent, while staying up past midnight raised it by 32 percent. The effect was especially pronounced for stroke risk, which jumped 70 percent for people regularly going to bed after midnight compared to the 10:00 to 11:00 p.m. group.
This doesn’t mean 10:37 p.m. is magically healthier than 9:45 p.m. The pattern reflects something broader: people who go to bed in that middle window tend to get enough sleep, keep a consistent schedule, and align their rest with their body’s natural production of sleep-promoting hormones, which ramps up after dark and peaks in the late evening.
Late Bedtimes and Mental Health
The risks of staying up late go beyond heart health. A Stanford Medicine-led study of nearly 75,000 people found that those who went to bed late had higher rates of depression, anxiety, and other mental health disorders. What made this finding striking is that it held true even for self-described night owls. People who naturally preferred staying up late still had worse mental health outcomes when they actually did stay up late, compared to night owls who went to bed earlier.
One explanation is a concept researchers call “mind after midnight.” After you’ve been awake for 16 or more hours, the cumulative stress of the day changes how your brain makes decisions. Late at night, there are fewer social guardrails because most people around you are asleep. That combination of fatigue, isolation, and impaired judgment can feed negative thought patterns and impulsive behavior. Going to bed earlier, even if it feels unnatural at first, appears to be protective regardless of your chronotype.
How Sleep Cycles Shape Your Bedtime
Your brain cycles through distinct stages of sleep roughly every 80 to 100 minutes, according to the National Heart, Lung, and Blood Institute. A full night includes four to six of these cycles. Each one moves through progressively deeper stages of non-dreaming sleep before shifting into the dreaming phase, and the mix changes as the night goes on. Early cycles are heavier on deep, restorative sleep. Later cycles are heavier on dreaming sleep, which plays a role in memory and emotional processing.
Waking up in the middle of a cycle, especially during a deep stage, is what makes you feel groggy even after sleeping a decent number of hours. If you know your wake-up time, counting backward in 90-minute blocks (a rough average of one full cycle) can help you land on a bedtime that lets you wake between cycles. For a 6:30 a.m. alarm, for example, falling asleep around 11:00 p.m. gives you five full cycles, while 9:30 p.m. gives you six.
Keep in mind that “bedtime” and “fall-asleep time” aren’t the same thing. Most people need 10 to 20 minutes to drift off. Build that buffer into your target.
How Much Sleep You Actually Need
Your ideal bedtime is really your wake-up time minus the hours of sleep your body needs. Those needs shift significantly with age:
- Toddlers (1 to 2 years): 11 to 14 hours, including naps
- Teens (13 to 17 years): 8 to 10 hours
- Adults (18 to 60 years): 7 or more hours
- Older adults (61 to 64 years): 7 to 9 hours
- Seniors (65 and older): 7 to 8 hours
Teenagers are the group most often shortchanged. A teen who has to be at school by 7:30 a.m. and needs nine hours of sleep should be asleep by 10:00 p.m. at the latest, which means being in bed by 9:30 or 9:45 p.m. In practice, very few teens hit that mark. If you’re a parent trying to set a bedtime for a teenager, working backward from their wake-up time is more useful than picking an arbitrary hour.
For adults, the seven-hour minimum is a floor, not a target. Some people genuinely function best on seven hours, others need closer to nine. If you consistently wake up tired after seven hours despite good sleep habits, you likely need more, and your bedtime should shift earlier accordingly.
How to Find Your Personal Bedtime
Start with your non-negotiable wake-up time on most days. Subtract the number of hours you need (at least seven for adults), then subtract another 15 minutes to account for the time it takes to fall asleep. That’s your target lights-out time. If you wake at 6:30 a.m. and need seven and a half hours, aim to be in bed by 10:45 p.m.
Consistency matters as much as the hour itself. Your body’s internal clock adjusts to a regular schedule, making it easier to fall asleep and wake up naturally over time. Shifting your bedtime by more than an hour on weekends (sometimes called “social jet lag”) can undo those benefits and leave you feeling off on Monday morning. If your current bedtime is far from your target, move it earlier in 15-minute increments every few days rather than making a sudden two-hour jump.
Pay attention to your body’s own signals, too. A dip in alertness, slight drop in body temperature, or heavy eyelids in the evening are signs your internal clock is priming you for sleep. Going to bed when those cues appear, rather than pushing through them for another episode or scroll session, is one of the simplest ways to improve both how quickly you fall asleep and how rested you feel the next day.