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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