Can you train yourself to need less sleep?

No. Research shows: people who were sleep-restricted (6 hours or less) adapted — subjectively they stopped feeling sleepy. But objective tests (reaction time, cognitive functions) continued to worsen. The brain adapts to the feeling of sleepiness, but not to cognitive deficit. You get used to living worse without noticing it.

Is it true that some people genetically need less than 6 hours?

Yes, but such people are extremely rare — about 1–3% of the population. This is a mutation in the DEC2 gene. Most people who consider themselves "short sleepers" are chronically sleep-deprived individuals who have adapted to the deficit. If you think you are among the 1% — most likely, you are not.

How Many Hours of Sleep Do Adults Need: Science vs. the 8-Hour Myth

Is the 'eight-hour rule' a myth, or is it actually the norm? The science of sleep requirements: why the optimal amount is individual and how to determine how much sleep *you* truly need.

🌿psybot.app·June 19, 2026·2 min read

“5 hours is enough for me.” “I’m used to 6 hours.” “Getting everything done is more important than sleeping.” These phrases are uttered by people who have convinced themselves they can get by on a minimum. But the body and brain say otherwise.

Let's break down what science knows about the need for sleep.

1. Official Recommendations

The American Academy of Sleep Medicine (AASM) and the National Sleep Foundation of the USA recommend:

Adults (18–64 years): 7–9 hours
Seniors (65+): 7–8 hours
Adolescents (13–17): 8–10 hours
School-aged children (6–12): 9–12 hours

2. Why Sleep Needs Are Individual

The need for sleep is genetically determined. The "normal" range among healthy adults is approximately 6–9 hours. Most people need 7–8. But for some, 6 hours is physiologically sufficient, while others need 9.

How to determine your individual sleep need? The simplest test: during a period without an alarm clock (vacation) — how much do you sleep when you don't have to get up? This is your norm. If you sleep 9 hours on vacation but usually wake up to an alarm after 6 — you are chronically sleep-deprived by 3 hours every night.

3. Consequences of Chronic Sleep Deprivation

Research documents: chronic sleep deprivation (less than 7 hours for most people) leads to:

Reduced concentration and working memory
Impaired decision-making
Increased risk of depression and anxiety
Weakened immune system
Increased risk of cardiovascular diseases
Metabolic disturbances (risk of diabetes)
Reduced life expectancy

4. Catching Up on Sleep on Weekends: Does It Work?

Partially. A short "sleep debt" can be compensated. But chronic sleep deprivation cannot be compensated by two days. Moreover: late sleep on weekends disrupts the circadian rhythm ("social jet lag"), making it harder to fall asleep on Sunday and Monday.

5. Quality vs. Quantity

7 hours of continuous restorative sleep > 9 hours of interrupted sleep. Both parameters are important. Pay attention not only to how much you sleep, but also to how you sleep.

See also: Sleep Hygiene. Discuss your sleep with our AI psychologist psybot.app.

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