Sleep science

Learn more about your sleep and how to make it better.

REM and non-REM sleep phases

Human sleep can be divided into two phases REM and nREM. Neuroon detects those phases and can show you when exactly they occured while you were sleeping. Find out more about REM and non-REM phases how Neuroon monitors them.


REM sleep is the paradoxical sleep during which our brain has the highest activity from the whole sleep cycle and what is mostly interesting - from psychological point of view this activity can be compared to our brain state when we are in the waking state.

REM abbreaviation comes from Rapid-Eye-Movement because when we are in the REM state our eyes are randomly moving, our muscles can be gently moving and contracting and also we can dream vividly. What is also interesting - during REM phase it is harder to wake up a sleeper. And finally this is the stage during which lucid dreams will occur. Check out how Neuroon Lucid Dreaming will work: https://neuroon.com/news/lucid-dreaming-neuroon/

NREM is the non-rapid eye movement stage of sleep characterized by slow eye movement. NREM sleep can be divided into two stages: light and deep sleep. In this phase we are resting the most and it occurs quickly after falling asleep and lasts approximetely 1 hour. Then there is the REM phase. These phases intersperse with each other during normal 8-hour sleep. The longer you sleep, the NREM phase is shorter and shallower.

During slow wave sleep metabolic rate is significantly reduced, blood pressure drops, breathing and the rhythm of the heart are slower, the kidneys produce less urine, and the food is moved slowly through the intestines - the body is resting. Also the temperature of our body drops half a degree. However, there are processes, which at this stage of sleep occur faster: for example increased levels of certain hormones and wounds heal faster.

It was previously thought that dreams do not appear in the NREM phase. Today we know that these dreams occur, though not in the form of specific images, but rather sensations (eg. fall) or colors visualization.

Depending on the age of the person the right amount of REM is estimated for around 25% of the whole sleep. REM phases occur around every 90 minutes and take from 5 to 30 minutes, which gives in total about 90–120 minutes of a night's sleep.

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