The thought of thriving on such little sleep鈥攁nd freeing up so many more hours of your day鈥攎ay sound tempting. But the reality is that the vast majority of us cannot function that way. Nor can you train yourself to need less shut-eye. A lot of people underestimate the amount of sleep their body ideally needs. And finding out how much sleep you need each night need may require some attention and experimentation.

How Much Sleep Do Humans Need?

Sleep scientists are in consensus about adults needing at least seven hours of sleep per night for the best health outcomes. More specifically, adults aged 18 to 64 should get of sleep, and adults aged 65 and over should get seven to eight.

A 2022 study published in found that older adults tended to make better and faster decisions, as well as have better working memory, when they got seven hours of sleep each night (not greater and not fewer).

Despite all this evidence, there are plenty of people who claim to need or want fewer than seven hours of sleep. But often they confuse how much sleep they need for optimal functioning with how much sleep they just happen to be getting, says , an associate professor of psychology and neuroscience at Baylor University.

There are, of course, exceptions. 鈥淭here are some individuals who can operate at a very high level on only a handful of hours of sleep,鈥� says Scullin. Research shows there are a that cause people to be 鈥渟hort sleepers,鈥� meaning they are highly functioning on just six hours of sleep a night.

Reasons Why It’s Hard for You to Get Enough Sleep at Night

If your bedroom is too bright, loud, uncomfortable, warm, cold, or crowded, it鈥檚 going to be difficult to get quality sleep, says , an applied economist who studies sleep. Sure, you might be waking up early. But that might be because your body just can鈥檛 stay asleep, not because you鈥檙e well-rested.

Schofield studies the behavioral economics of sleep, focusing in particular on working communities in India. In her work, she found that when it comes to sleep and productivity, there are factors beyond the need for rest that can change people鈥檚 perception of how much sleep they need, especially when it comes to time.

鈥淲hen you use time to sleep, you can’t use that time to do something else,鈥� Schofield says. And so for some, their perceived 鈥渙ptimal鈥� amount of sleep might be a shorter duration than what鈥檚 best for their health, simply because they can get more stuff done. It鈥檚 a cost-value trade-off that every population, regardless of nationality or socioeconomic status, has to consider, she says.

Figuring Out How Much Rest You Need for Optimal Performance

To find out how much sleep your body requires for optimal focus and energy, Scullin says to do the following:

1. Make sure your room is comfortable, quiet, dark, and cool
2. Give yourself a lot of time to be in bed.
3. Put your electronics away and don鈥檛 set an alarm.
4. Simply lie down鈥攁nd let yourself fall asleep and wake up at a natural time.

鈥淚f you do [these steps] across one week, or maybe two weeks, then you’re eventually going to hone in on how much sleep your personal body actually needs,鈥� Scullin says.

From there, it鈥檚 time to adjust your habits for the better. 鈥淭he great news is, if you do increase your sleep, it’s pretty immediately rewarding,鈥� he says. Sure, you may feel a little drowsy as your body adjusts to all those extra hours, 鈥渂ut as you get into a healthier sleep pattern, you鈥檒l find your mood improves,鈥� he says. 鈥淵ou’re probably even going to experience a happier outlook on life鈥攁nd that’s really fulfilling.鈥�

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