Sleep the most important thing in humans to restore energy to
brain. It has a circadian cycle and a sleep last for about 90
minutes with REM and non REM.Nearly 4-6 cycles occurs throughout
the night
Sent of the biological changes are
- The body will be in a anabolic state ,where all voluntary
actions of muscles are inhibited
- The ability to respond to a stimuli is very less
- The ATP are restored to the parts which were deprived to regain
its energy and functions
- The sensory thresholds are decreased
- The growth hormones are secreted during sleep at slow wave
cycle
- The body temperature and heart rate falls down
- Desynchronization
occurs with fast eye movements ,loss of muscle tone and aiding
in homeostasis