The Basics of Enough Sleep: Overview It is essential to have sufficient sleep to keep your healthy body mind How much need to sleep? Most adults need good quality sleep for 7 to 8 hours at regular intervals every night. Make changes in your proper routine if you do not have enough time while you sleep. Do not sleep enough; it is also important to sleep well at regular times. When you get up, you take a break. If you have a lot of problems while you sleep or if you feel tired even after sleeping, talk to your doctor. How many children need to sleep? Children need more sleep than adults Sleep requires 8 to 10 hours to sleep each night. Girls at school need 9 to 12 hours of sleep each night. Preschoolers must sleep between 10 and 13 hours (including naps) during the day.