Truly "deep" sleep does not occur during REM sleep. REM sleep is when you are dreaming. It is deeper than light sleep, but not as far down in unconsciousness as "deep" sleep.
They occur during REM sleep, usually in the second half of the night
They occur during REM sleep, usually in the second half of the night
REM (Random Eye Movement).
Very recent research suggests that dreams that occur during REM sleep tend to be more agitated and troubled than dreams that occur during non-REM sleep. More research is being done to better understand the difference.
No, during REM sleep, the brain is active, however any muscle activity is suppressed to prevent you from acting out dreams. During stages 3 and 4 of NREM sleep sleepwalking is known to occur.
Sleep is prompted by natural cycles of activity in the brain and consists of two basic states: rapid eye movement (REM) sleep and non-rapid eye movement (NREM) sleep, which consists of Stages 1 through 4. During sleep, the body cycles between non-REM and REM sleep. Typically, people begin the sleep cycle with a period of non-REM sleep followed by a very short period of REM sleep. Dreams generally occur in the REM stage of sleep. Then the cycle repeats all over again.
The dreams that we remember tend to only occur during REM sleep. However, new research is showing us that dreams can actually happen in NREM sleep. Research is still being done to determine exactly what kind of dreams when have in the different stages of sleep.
Most vivid dreams occur during REM sleep, which stands for Rapid Eye Movement. REM The vividness of dreams might depend more on whether one awakens directly from the dream or not, rather than the stage of sleep where dreams occur. Sleep studies have shown that REM (rapid eye movement) sleep correlates closely with dreaming, but dreams occur during other sleep stages as well. Night terrors, sleep walking and other disturbances tend to appear during deep or slow-wave sleep, Stage N3. See the attached Wikipedia article, below, for further information and resources. In REM sleep. REM-sleep. It stands for rapid eye movement, a characteristic of dreaming in which the eyes flutter side to side very quickly as the brain works. It happens during stage 5 of sleep.
REM
During REM sleep, people seldom dream.
The stage of sleep called REM, for "rapid eye movement", is the stage during which dreams occur. If you are awakened while in REM sleep, you remember your dream. This is one of the deeper stages of sleep, and is named after the fact that an observer can see the subject's eyeballs moving rapidly about beneath closed eyelids during this state.