Sleep Cycle:

The complete cycle of sleep:

Sleep is necessary for the people as they need to conserve energy, restore it and then let it out. There are various cycle but it is seen that one sleep cycle comprises of four stages and last for about 90-120 minutes. The phenomenon of dreams can occur in any of the four stages of sleep but the most vivid and memorable dreams occur in the last stage of sleep (also commonly referred to as REM sleep). It is seen that sleep cycle repeats itself about an average of four to five times per night, but may repeat as many as seven times. During these sleep cycles when the dreams occur it is seen that people swear on the fact that they simply do not dream when in reality, they just don't remember their dreams.
Sleep stages:
There is a drift of wakefulness to sleep and then the actual cycle begins as our eyes move very slowly and muscle activity slows. Then it is the second stage where eye movements stop and our brain waves that are fluctuations of electrical activity that can be measured by electrodes become slower, with occasional bursts of rapid waves called sleep spindles. The body temperature lowers and the body temperature decreases. At the beginning of the next stage it is seen that slow brain waves called delta waves begin to appear, interspersed with smaller, faster waves. It is observed that there is no eye movement or muscle activity. People awakened during deep sleep do not adjust immediately and often feel groggy and disoriented for several minutes after they wake up.
REM sleep:
During various cycles of sleep this can occur anytime where, our breathing becomes more rapid, irregular, and shallow, our eyes jerk rapidly in various directions, and our limb muscles become temporarily paralyzed. There is a rise in the heart rate and our blood pressure rises, and males develop penile erections and the main action is the dreaming of people in this stage. Generally After a person falls asleep, the first REM sleep period generally happens 70-90 minutes later.

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