During sleep, the human brain passes through five different stages. And one of these stages is Rapid Eye Movement(REM) sleep. During this phase, the movement of eyes goes in fluctuate in various other direction.
People enter in this cycle during the first 90 minutes of falling asleep. And since the sleep cycle repeats throughout the night, REM sleep occurs multiple times. It accounts for 20 to 25 per cent of adults sleep cycle and near about 50 per cent of infants sleep.
REM sleep is kenned as a phase that critically influence the memory, learning and mood of the being.
Human sleep cycle starts with non REM sleep, gradually moves towards REM sleep stage. The first phase of the REM sleep generally last up to ten minutes, but with concurring stages, the timing becomes progressively longer. And many types of research have shown that the final phase of REM sleep may last for an hour, give or take.
During the course of REM sleep, the body and brain go through several changes. It might include the rapid movement of eyes, uneven breathing pattern, elevated heart rate or fluctuation in body temperature. Furthermore, it can also affect the blood pressure, brain activity and can even hamper the oxygen consumption of the brain.
REM sleep often causes very vivid dreams due to the increase in brain activity. Also, the muscles of the body are immobilised even the brain is active, this stage is sometimes referred to as paradoxical sleep.
Although there are some great benefits of REM sleep, there are some people that are affected by REM sleep behaviour disorder which is a condition where the general phenomenon of muscle paralysis that normally takes place during the phase of REM sleep does not occur. This causes the person to act impulsively during the vivid dreams. The actions can go from kicking and yelling to some serious damage.