There is no universally agreed definition because falling a sleep is not a split-second occurrence, not an abrupt switch from awake to a sleep. Rather, it is a gradual progression of stages in which body and brain activity changes. Sleep onset is sought of a reflection of your brain switching from one way of thinking it is said by Scott Campbell. Decides brain activity, sleep researchers measure eye movements and muscle tension to observe a person falling asleep. Then if you feeling like good you just conk out until morning then sleep at night has a typical structure. Most people are familiar with rapid eye movement, or rem, sleep.
Before the heavy dream period, we undergo non rapid eye movement, or rem. which takes up 75% of sleep time that is divided in to four stages. In the first stage we find dozing off, with our brain waves and muscle activities slowing down. Some people would call that as sleep but, when woken up during stage one and asked if they were asleep, about 80% of people will say they were not sleeping.
In the next stage 60% of the people would deny it, though Campbell says researchers agree that this is sleep. Usually comprising about half of sleep time, stage two means a calmer brain wave pattern and no eye movements. Breathing slows and body temperatures drops slightly. A person in stage two lost touch with the surroundings but can easily be shaken awake.
Finally in the stages 3 and 4, waking someone up probably requires an annoying alarm. Breathing slows even more in to a rhythm. Blood pressure and the body temperature drop again and muscles relax. These two similar states are called slow wave sleep, with the slowest of all brain waves. This is the restorative, deep sleep we crave when we were tired. Scientists believe that much of the bodies regenerative work, like protein building and hormone buildings, happens at this stage.
About 90 minutes after falling asleep, rem sets him and hypes up the slow wave sleep into a state that’s very close to being awake, with brain waves of the same speed are even faster. Some of the dreams occur in this phase. And in this phase the heart beats quickly, the blood pressure rise up, eye dart around and breathing becomes rapid and shallow. The body is more or less paralyses arm, leg and facial muscles might twitch, but the body wont move.rem can last from 5 to 30 minutes.
After rem, nrem starts again. As the time at night goes on increasing then the time spent in rem increases and deep sleep decreases so that when the rooster crows, it’s almost all stage one, stage two, rem sleep. Hormones, chemicals and regions of the brain interact to drive the sleep cycle. The bodies’ biological clock or carcadiun rhythm synchronizes a person’s sleep scheduled with the day/night cycles changing amounts of light.
- Rejuvenates the energy of the body.
- Relieves the stresses in the body.
- Sleep makes yur mind fresh.
- Always sleeping makes you lazy.
- Heavy sleeping makes you stout.
- Time to time sleeping is recomended if not causes health problems.