What are the 4 stages of sleep?
The 4 Stages of Sleep (NREM and REM Sleep Cycles)Entering Sleep.NREM Stage 1.NREM Stage 2.NREM Stage 3.REM Sleep.Sequence of Sleep Stages..
What is the deepest stage of sleep?
Electroencephalography. These four sleep stages are called non-rapid eye movement (non-REM) sleep, and its most prominent feature is the slow-wave (stage IV) sleep. It is most difficult to awaken people from slow-wave sleep; hence it is considered to be the deepest stage of sleep.
What are the five stages of sleep quizlet?
Terms in this set (11)REM. Rapid Eye Movement. … NREM. Non-Rapid Eye Movement. … Stage 1. Theta Waves (6 to 8Hz). … Stage 2. Theta Waves (4 to 7Hz). … Stage 3 and 4. Delta Waves (1 to 3Hz). … Stage 5. Beta Waves. … EEG. Electroencephalograph. … Beta Waves. Waves when we are awake.More items…
Why do I wake up at 2am for no reason?
Waking up in the middle of the night is called insomnia, and it’s a common problem. Mid-sleep awakenings often occur during periods of stress. Over-the-counter sleep aids rarely offer significant or sustained help for this problem.
Why do we wake up at 3am?
You wake up at 3am because this is the time you shift from a deep sleep into a lighter sleep. If you turn in at 11pm, by three in the morning you’re mostly out of deep sleep and shifting into longer periods of lighter sleep, known as REM.
What are the 5 stages of sleep called?
During sleep, the body moves through five different stages of both REM (rapid eye movement) and NREM (non-rapid eye movement) sleep. Over the course of the night, the body will go through this five-stage cycle four to six times, spending an average of 90 minutes in each stage.