When someone said that we spend almost half our lives sleeping, I was almost offended and immediately started to defend that - no, we don't. But later, when I started to really think and reflect on it, it seemed somewhat true. I counted my own hours of sleep - 10-11 hours ( I used to sleep much less earlier ); that'd be almost half the day of 24 hrs. So, if I'm a certain age now, then, yes indeed - almost half that age I've spent sleeping. Not just me, every creature in this world sleeps. A baby would sleep whole day infact baring the little time it wails for its feed. As it grows slowly, only then the sleep time reduces as it starts activities like play and interactions with other humans. As it becomes a child going to school, further, it's sleep reduces - but still average would be around 10-11 hours ( or maybe even more ), that he'd sleep. So, why do we sleep at all, when we've come to this world. Its like God designed it intentionally - and those who doesn't believe in God - lets say our body was designed to sleep. During day time, when sun is up - wake and do things; and once its night time, and sun disappears, we too need to retire for the day. But question remains - why sleep at all? Whats the greater purpose behind it. Is there anything related to health? Many science studies have said that proper sleep is important and have its benefits - and there's definately a purpose behind it; although, the whole process still remains somewhat a mystery and nobody has clear answers.
However, intense observation, research and studies show that sleep is important because it -
On the other hand, lack of sleep is dangerous to your body - it can lead to cell-degeneration, feeling bad/tired/fatigued/irritated the whole day, can lead to heart attack and escalate diseases like diebetes/cancer, and sometimes even death. Its said, when you don't sleep properly and new cell doesn't get generated then the existing cells in brains starts attacking each other which can result in ill-health and other cognitive problems. Over-sleep too however can have its drawbacks - affects metabolism and increase diseases.
Sleep Types : There are two types of sleep - rapid eye movement (REM) sleep and non-REM sleep, and we experience both in our entire sleep cycle several times through the night :
1. Non-REM sleep has two stages where in first stage its the zone between being awake and falling asleep. We may or may not see dreams in this time and most sleep paralysis or occult experiences happen in the light sleep that follows, when our breathing and heart rate regulates and body temperature drops. This is followed by deep sleep, when we don't see any dreams and it is when the body actually heals and is most important part of sleep cycle. The NREM lasts about two hours overall.
2 REM sleep is after the deep sleep state, and lasts about an hour or so and the eyes move rapidly behind closed eyelids. The breathing becomes irregular, and the body temporarily paralyzes to prevent acting out dreams. Both NREM and REM together is a sleep cycle that can last 2-3 hours each.
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