What happens when we sleep?

 


Every  night  almost everyone on the planet 

 falls  into a state of unconsciousness and paralysis.  But what  actually   happens   in  the  body?  

 When   do  we  drift?  And  what   are  the  consequences   of   not   getting  enough sleep?  Sleep is regulated by your circadian  rhythm.  

or  the   biological   clock  in the brain.  The  inner  clock  reacts  to light  signals,  

 increased  production of the hormone melatonin at night 

and  turn  it off when it senses light.  There are four stages of sleep 

that the body  goes   through  throughout the night.  On a good  night  we  go  through these  phases  



four or five times.  The   first  and  second   phase   is  light sleep.  This is  the  transition from  wakefulness  to  sleep.   Heartbeat  and breathing begin to  slow   down  

 Body  temperature  drops  and muscles may twitch.  The   third   phase  is sometimes  called   delta   sleep.


   

   due  to  slow delta brainwaves 

 which  are released  at  this  time.  This is the first  phase  of deep sleep, 

where our cells produce  most growth hormone 

to  maintain  bones and muscles, 

 so  the body  can   recover.   At   the   fourth   level  we begin to dream.  The body  produces  chemicals 

 making   him  temporarily paralyzed 

 So  we  don't   make  our  dreams   come   true.   During  this  phase,  the brain is extremely  active.  


and our eyes,  though  closed,  darted   to  and  fro  

 like   we're   awake  Humans  spend  about   a   third  of their lives  sleeping.   modern   lifestyle,  stress, 

and  dissemination  of technology 

 means  that people are sleeping  a   lot  less today 

than  a century ago.  Sleep  less than seven hours  a   night  

 associated with  increased risk 

 development  of  chronic  diseases  

which  can   shorten  life expectancy.  So,  for a  healthier   and  longer life you   should   take   a   nap. 



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