Red Heart Care Sleep Series: Sleeping type, fast and slow wave sleep phase!
The brain activity during sleep is not at rest, but rather a series of cyclical changes that are actively regulated. At this time, various physiological functions of the body, such as sensory function, motor function and autonomic function crown, have regular activities to varying degrees with the change of sleep depth.
According to the comprehensive analysis of EEG activity, eye movement and muscle tension during sleep, sleep can be divided into two different phases, namely slow wave Sleep phase and fast wave sleep phase.
1. Slow wave sleep is also known as non rapid eye movement (NREM) sleep.
This period is characterized by slow systemic metabolism, stable breathing, slow heart rate, decreased blood pressure, decreased body temperature, reduced muscle tone (but still able to maintain a certain posture), no Obvious eye movements.
The slow wave sleep period is divided into stage 1 (sleeping period), stage 2 (light sleep period), stage 3 (moderate sleep period), and stage 4 (deep sleep period).
The cerebral blood flow during slow wave sleep is reduced, and the activity of brain neurons is weakened in most areas, and the growth hormone secretion is increased, which directly or indirectly promotes growth and development.
If sleep time is reduced, it may affect the development and growth of children’s physique.
Second, fast-wave sleep, also known as rapid eye movement (REM) sleep, also belongs to deep sleep.
The activity of the brain during fast-wave sleep is very similar to that of awake, with shallow and irregular breathing, increased heart rate, blood pressure fluctuations, loss of thermoregulatory function, in addition to eye movement and respiratory movement. As the muscles continue to move, the muscles of the limbs and trunk are almost completely relaxed.
In the fast-wave sleep period, brain metabolism and cerebral blood flow increase, and brain neuron activity is enhanced in most areas. The dream of fast-wave sleep is the reproduction of memory information. It is the process of rearranging the learning information, which helps to form new neural connections and improve the effect of learning and memory. Therefore, we often find that the new knowledge learned yesterday is more profound in the memory impression after a night of sleep. This is the truth.
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