The way the body regenerates while sleeping (Sleeping phases)

When you’re sleeping, your body relaxes and receives back all the energy levels you’ve lost during the day. The sleeping process is a very important process for both your physical and mental health. How many times it happened for you to lose the stress you’ve accumulated the previous day, or to realize that your cold is half gone already?

What happens when we sleep?

Sleeping is a very natural process of the brain activity, which is realized in two phases: REM (rapid eye movement) and NREM (non-rapid eye movement). NREM consists of 4 phases. During the sleeping process, there is a constant transition between REM and NREM. The dreaming process mainly happens in the REM sleeping phase.

What is NREM sleeping?

The NREM sleeping consists of 4 phases. Every phase lasts 5-15 minutes. The complete process of sleeping consists of progression from phase 1 to phase 4, then switching to the REM phase (phase 5). After the REM phase, the process starts all over again.

Phase 1

polysomnography (Scanning of the brain activity) which shows decreased body activity, which means that the body transits from being awake to the first phase of sleeping. Even though your eyes are closed, you can be very easily woken up. If the sleeping is interrupted in this phase, you will feel as if you never went to sleep. The first phase lasts 5-10 minutes. Have you ever dreamt about falling, and then you felt a sudden contraction of the body? This happens in the first phase.

Phase 2

This is the part of light sleep, where the brain activity has elations and falls, i.e. positive and negative waves. These waves show spontaneous periods of muscular contractions. The heart pumping rate slows down, the body temperature decreases. The body is preparing to get into a deeper dream.

Phase 3 and 4

These are the deep sleep phases. Phase 4 is stronger than phase 3. These phases are known as slow waves, or delta sleeping. If you’re woken up in these phases, you could feel disoriented for a few minutes.

During the NREM sleep, the body fixes and regenerates the tissue, builds the bones and the muscles and strengthens the immune system. The early ageing is also connected to the short sleep, although the researches show that the need for sleep is the same throughout the years.
Sleeping in the proper time period is also important for some hormone excretion, such as melatonin – the growth hormone, testosterone e.t.c. We already know that there is not testosterone without any sleep.