How much sleep do you need?
Sleep needs change dramatically across your lifespan. Newborns require up to 17 hours while healthy adults need 7–9 hours. These recommendations represent total sleep including naps for younger age groups.
For adults, 7–9 hours typically means 4–5 complete 90-minute sleep cycles. Use our sleep cycle calculator to find exact bedtimes, or the sleep debt calculator if you have been running short.