How do people sleep?

How do people sleep? Like when do they body know its right to sleep?

You know it's time to sleep when you're tired!!

Ahahaha, seriously thou One would never relate sleep with frenzied cerebral activity and hyper-active physiological functions. But that’s exactly what happens when you’re in a deep restful slumber. So discover more interesting things about the activity that you spend a third of your life doing.

Researchers say that sleep is not a passive phenomenon but an active state, during which the brain buzzes with activity. Eyes begin to roll back and forth, in what is known as REM (Rapid Eye Movement), blood pressure and heart rates are elevated. Periodic twitching of the face and extremities, a relatively high level of oxygen consumption by the brain and increased blood flow to the brain are some of the activities taking place as you sleep.

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Most adults can stay awake for 200 hours at a stretch, but after 120 hours, a majority break down and display disorders like disorientation, hallucinations, confusion, disregard for personal hygiene and a lack of interest in their surroundings.

Hypersomnia or daytime sleepiness is an unwitting activity which causes an irresistible urge to lie down in order to rest. It mostly affects unemployed or young people and is marked by periods of excessive sleepiness for two to four weeks coupled with a ravenous appetite and psychotic like behaviour during waking hours. It is also an early signal of depression, in some cases. Some famous day-time nappers include artist Leonardo da Vinci, Winston Churchill, Albert Einstein and many more. Waterloo adversaries Napoleon Bonaparte and the Duke of Wellington were both accustomed to catnaps, even on the battlefield.

Feel drowsy after a particularly heavy mid-day meal? This is due to the requirement of the abdomen for a larger quantity of blood to aid in the digestive process. The blood supply gets diverted to the digestive organs in the abdomen, which temporarily depletes the brain of its normal supply. This results in a feeling of malaise and sleepiness.

Sleep paralysis is a temporary condition in which the subject wakens but is incapable of moving a muscle and seems to still be asleep. The victim is actually involved in a struggle for movement, fraught with acute mental distress.

The world’s champion sleeper is the two-toed sloth, that logs in a total of 20 hours of sleep in a day. Rats, hamsters and pigs sleep for 12 hours, while pet cats and dogs sleep for 13 to 14 hours. Elephants, giraffes and horses sleep as little as two to four hours a day.

Creative people analyse their dreams to produce works of art. Poet Samuel Taylor Coleridge claimed to have composed his famous Kubla Khan as a result of a vivid dream. are L Stevenson was said to have come up with the plot of The Strange Case of Dr Jekyll and Mr Hyde in a dream.

Emmanuel Mignot a sleep specialist at Standord Medical School, California, believes that there is a ‘clock’ gene in mammals, which helps regulate their body clocks and determine preference for morning or night activities.

Another study claims that cryptochrome, a light sensing protein, regulates the ebb and flow of the body clock. The intrinsic machinery of the body clock can be reset by light.
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When you think that you want to refresh or when you want to restart.