Rapid eye movement sleep (REM) is one of the 5 stages of sleep that the majority individuals experience at night. It is characterised by fast, random movements of the eyes and dysfunction of the muscles. The time spent in slumber varies considerably with age; it usually makes up around 20-25% of Associate in Nursing adult humans total time spent asleep (on average concerning 90-120 minutes), and roughly eightieth of a newborn's. People typically experience rapid eye movement four or five times an evening (it comes in cycles), the primary cycle - that happens at the beginning of one's sleep - solely lasts for a brief time, with every following cycle being a bit longer. It is common for a few individuals to experience lightweight sleep, or maybe to rise when a cycle begin. The time one spends in slumber encompasses a heap to try to with bound psychological factors - individuals with depression tend to be within the state for a shorter period than those while not. Studies have shown that individuals who attend sleep when being sleep disadvantaged enter rapid eye movement quicker than those that weren't. While in rapid eye movement, most of the muscles become paralytic and therefore the activity of the brain's neurons becomes quite intense, kind of like the activity throughout wakefulness. This can be the reason for rapid eye movement is typically called slumber. It's throughout this stage of sleep that the majority individuals are not able to have particularly vivid dreams.