Check recommended sleep for your age.
Sleep need falls with age in a stepped rather than smooth way, and the widely used National Sleep Foundation bands capture it: fourteen to seventeen hours for a newborn, nine to eleven at primary school age, eight to ten for teenagers, seven to nine for adults, and seven to eight past sixty-five. The teenage figure is the one most often mismanaged, because adolescent circadian rhythm shifts later while school start times do not, producing chronic restriction in a group that needs more sleep than adults. Naps count toward the daily total, which is why they are included here, though they are less restorative than consolidated night sleep. Debt accumulates: forty-five minutes short on five nights is nearly four hours a week, and while recovery sleep repays some of it, the evidence suggests attention and glucose handling do not fully normalise on a single long weekend lie-in.
Age-banded sleep need and accumulated debt
Total daily sleep = night hours + nap minutes / 60; shortfall = max(0, band minimum - total sleep); weekly debt = shortfall x nights a week that fall short
General guidance based on published sleep recommendations, not medical advice. Persistent short sleep, unrefreshing sleep, loud snoring, or daytime sleepiness despite adequate hours can indicate a sleep disorder such as sleep apnoea or insomnia — consult a doctor rather than self-managing.
Partly. Recovery sleep restores subjective alertness reasonably well, but studies find that attention lapses and insulin sensitivity do not fully return after a weekend of catch-up. Consistency beats compensation.
Because adolescence involves substantial neural and physical development, and the adolescent circadian rhythm also shifts one to three hours later. Needing eight to ten hours while being unable to fall asleep before eleven is a biological conflict, not laziness.
They contribute to the daily total and a twenty-minute nap measurably improves alertness. They are not equivalent to consolidated night sleep, though, since long naps late in the day reduce the drive to sleep at night.