Average sleep time is too long or too short adverse health

Sleep time varies Normal sleep cycle in two -phase structure : non-rapid eye movement sleep (NREM) and rapid eye movement sleep (REM). NREM and REM alternating , alternating once called a sleep cycle , two kinds of the cycle, usually 4-5 nightly sleep cycles, each cycle 90-110 minutes. In fact , sleeping for a long time and sleep time is short , like not conducive to health. So exactly how long to sleep more healthy? Sleep humans of different ages are different , the baby 's sleep time is 20-24 hours , children need 9-12 hours , 9-10 hours to children , adults require 7-9 hours , 6-8 hours needs of the elderly , greater than 80-year- old people need 9-10 hours. Since the elderly shallow sleep at night , daytime fatigue after exercise , but should be based on their physical condition , the environment, labor intensity and other comprehensive factors to consider . How long will it take for the elderly sleep is considered normal , domestic and foreign experts and scholars never unified understanding. Sleep scholars believe that , do not rigidly adhere to the number of hours of sleep per night , slept until the next day as long as the spirit of strong, clear-headed, high efficiency , deal with the problem properly , it shows that sleep is sufficient. Comprehensive conditioning to help you sleep Sleep in a large extent it is a habit, and thus maintain good sleep habits, sleep follow the laws of nature , is the best way to prevent sleep disorders . They also need to understand the possible causes of insomnia , eliminate factors that affect sleep , self-regulation and improve bad mood. Here are a few ways to improve sleep : regular schedule, to relax before going to bed thinking ; wake up on time every day ( including holidays ) ; bedroom environment should be comfortable , suitable temperature (18-24 ℃), avoid glare , noise, etc. ; daily moderate regular activities ; dinner but eat , do not drink bag factory after a meal , coffee, tea, do not smoke ; insomnia avoid napping during the day .