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The course of the various phases of sleep

May 21,2021

When we sleep, we are only apparently inactive. In fact, once we are asleep we go through complex neurophysiological processes that put us back on our feet for the next day.


When we fall asleep at night, our body sets off on a journey. after the phase of falling asleep, he enters a phase of light sleep, then of slow sleep, to then sink into deep sleep. This last phase is accompanied by a drop in pulse and blood pressure. Respiratory and brain activity are also reduced during sleep. REM (Rapid Eye Movement) sleep then begins. This phase is distinguished by the appearance of short, rapid brain waves and jerky eye movements. It is during REM sleep that the brain fixes what we have learned during the day.

The deep sleep phase

The deep sleep phase is essential, because this is where we can regenerate ourselves. This is the phase of our sleep where we recover the most. Our body then produces a maximum amount of growth hormone, while renewing our cells. It is essential for the growth of nails and hair, but also for the healing of wounds. Our immune system is also strengthened during this phase. We hardly dream during deep sleep. And if we are dreaming, we usually don't remember anything when we wake up.

We are very active during the REM phase

After deep sleep begins the REM phase. Our eyes then start to move quickly. This is what led researchers to talk about REM sleep, for “Rapid Eye Movement”. During the REM phase, the body shifts into high gear: brain activity, breathing, pulse and blood pressure almost reach the values of the waking state. During sleep, our body needs almost the same amount of calories as it does during the day while at rest. Only the muscles remain completely relaxed during the REM phase. The goal is probably to prevent us from actively participating in the crazy dreams that our brain projects on our internal screen during REM sleep. The REM phase is the dream phase: if you wake up during REM sleep, we often remember our dreams perfectly. This is due to the fact that the brain does not function here as in deep sleep but as in the waking state. REM sleep is also referred to as "REM sleep"

The REM phase alternates with the NREM phase, the seat of light sleep and deep sleep. The abbreviation NREM comes from “Non Rapid Eye Movement”.

Chronobiological awakenings: for a less painful awakening

Between phases of sleep, we are almost awake at times. It is more pleasant to get up at these times than during a phase of deep sleep.


It is on this observation that chronobiological awakenings are based: thanks to sensors built-in a smart watch, this alarm clock identifies our moments of rapid awakening. The sensors are based on our movements, which increase in intensity at these times. Chronobiological awakenings then wake us up with ringing or vibrations during a predefined time interval. If the chronobiological alarm clock does not identify a state of rapid awakening, as a safety measure, it wakes us up automatically at the end of the set time interval. Chronobiological awakenings are generally reliable, but they may not correctly identify superficial moments of sleep in some people.

Umeox Smart Watch: Sleep monitoring

The alternative is sleep trackers. Umeox Smart Watch allow you to learn more about sleep phases, sleep behavior and sleep duration. It can help us optimize sleep. There are two types of sleep trackers: fitness bracelet with wake-up function or contactless sleep monitoring system for mattresses.


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