Wie viel Schlaf brauche ich

The recommended range for adults 18-64 is 7-9 hours per night, set by a National Sleep Foundation expert panel (Hirshkowitz et al. 2015, Sleep Health) and echoed by the AASM and Sleep Research Society consensus that adults should sleep 7 or more hours regularly (Watson et al. 2015). Six hours sits below that band for the large majority. A single short night is not harmful, but as a habitual pattern it is a deficit rather than a personal setting. The recommendation is age-dependent: teenagers need 8-10 hours and older adults 7-8, but the range for working-age adults is where most 'do I need 8 hours' questions actually sit.

Van Dongen et al. 2003 (Sleep) restricted adults to 4, 6, or 8 hours in bed for two weeks. The 6-hour group's cognitive performance kept declining until, by the end, it approached the impairment seen after one to two nights of total sleep deprivation, yet their subjective sleepiness plateaued after a few days. That is the mechanism behind 'I do fine on 6 hours': the deficit is real and accumulating, but the internal alarm that would report it has gone quiet. Judging your need by how sleepy you feel therefore systematically underestimates it once you have been short for a while.

Sleep need is highest in early life and settles into a stable adult band. The National Sleep Foundation ranges are roughly 14-17 hours for newborns, 10-13 for preschoolers, 9-11 for school-age children, 8-10 for teenagers, 7-9 for adults 18-64, and 7-8 for adults 65 and over (Hirshkowitz et al. 2015). The adult figure barely changes across working life; what changes with age is sleep architecture (less deep sleep) and timing, not the total requirement. So an older adult sleeping seven hours is meeting need, even though the sleep is lighter and more fragmented than at 25.

A small number of people truly function well on under 6 hours, and it is genetic. He et al. 2009 (Science) identified a DEC2 (BHLHE41) mutation in a family of natural short sleepers, and later work found additional variants. These people show no measurable deficit on short sleep and no weekend catch-up. The key word is rare: such variants affect a very small fraction of the population, far fewer than the number who claim to be short sleepers. If you rely on an alarm, feel sleepy in the afternoon, or sleep markedly longer on free days, you are almost certainly not one of them.

If 6 hours were genuinely enough for you, your body would not demand more when the alarm is off. Sleeping two or more hours longer on free days is the clearest behavioural sign of an underlying deficit: your true need reveals itself as soon as the schedule stops suppressing it. This rebound also widens the gap between your workday and free-day sleep timing (social jet lag), and catch-up sleep only partially reverses the performance cost of the preceding restriction. Consistent adequate sleep beats a weekday deficit patched by weekend recovery; see the guide on sleep debt for how that debt builds and repays.

Start from the 7-9 hour baseline, then calibrate. Hold a fixed wake time every day, which anchors the clock, and across a lower-obligation stretch go to bed when you feel sleepy and let sleep end without an alarm. Over a week or two the unforced duration stabilises near your real requirement. Judge the result by daytime alertness, not by how you feel in the first minutes after waking, which is confounded by sleep inertia. Protect time in bed too: a 7-hour opportunity yields somewhat less actual sleep once onset and brief awakenings are subtracted. This article is educational and not medical advice; persistent daytime sleepiness despite adequate time in bed warrants a clinical evaluation.