which group experiences the highest level of rem sleep
Rapid eye movement sleep Although it manifests differently in different animals, REM sleep or something like it occurs in all land mammals as well as in birds. The primary criteria used to identify REM are the change in electrical activity, measured by EEG, and loss of muscle tone, interspersed with bouts of twitching in phasic REM.[85] The amount of REM sleep and cycling varies among animals; predators enjoy more REM sleep than prey.[17] Larger animals also tend to stay in REM for longer, possibly because higher thermal inertia of their brains and bodies allows them to tolerate longer suspension of thermoregulation.[86] The period (full cycle of REM and non-REM) lasts for about 90 minutes in humans, 22 minutes in cats, and 12 minutes in rats.[87] In utero, mammals spend more than half (50â€“80%) of a 24-hour day in REM sleep.[22]
Night terror Night terror, also known as sleep terror, is a sleep disorder, causing feelings of terror or dread, and typically occurs during the first hours of stage 3-4 non-rapid eye movement (NREM) sleep.[1] Sleep terrors begin in children between the ages of 3 and 12, and usually stop during adolescence. In adults, they most commonly occur between the ages of 20 to 30. Though the frequency and severity vary between individuals, the episodes can occur in intervals of days or weeks, but can also occur over consecutive nights or multiple times in one night.[2] This has created a situation in which any type of nocturnal attack or nightmare may be confused with and reported as a night terror.[3]