Sleep

Sleep is a physiological phenomenon in which the body plunges into an unconscious state, during which communication with the outside world is significantly weakened, and brain activity is almost imperceptible (except for maintaining the basic vital functions of the body, such as breathing), but is clearly defined in the brain. electroencephalogram (EEG).

According to the characteristics of the EEG, five stages of sleep are distinguished, which are characterized by different waves. In a state of relaxed wakefulness, a rhythm with variable amplitude predominates. In stage A (the transition from wakefulness to sleep), it gradually disappears and long intervals with very small waves appear. Stage B (falling asleep and shallow sleep) is characterized by waves. In stage C (superficial sleep), high-amplitude waves and spindle-shaped bursts of rhythm (sleep spindles) appear. In stage D (moderate deep sleep), fast waves are recorded, and in stage E (deep sleep), extremely small waves are recorded.

Periods of sleep characterized by slowing waves are periodically interrupted by episodes of paradoxical or rapid eye movement sleep, when the EEG curves resemble those of wakefulness (desynchronization). Dreams occur during REM sleep. Normally, REM sleep occurs after about 1.5 hours, lasts about 20 minutes, and its duration gradually increases. It accounts for about a quarter of total sleep time.

Sleep is a physiological phenomenon that allows the body to rest and recover after a hard day or night. It can be either healthy or pathological and can lead to various health problems if not properly controlled.

During sleep, the brain enters a state in which connections with the outside world become less active and brain activity decreases. This allows the body to regain its strength and prepare for the next day.

There are five stages of sleep:

1. A - transition from wakefulness to sleep. At this stage, the brain begins to go into rest mode, but not completely yet.
2. B - falling asleep and shallow sleep. At this stage, waves appear on the electroencephalography (EEG), which indicate that the brain begins to disconnect from external stimuli.
3. C - superficial sleep. At this stage, high-amplitude waves and spindle-shaped bursts appear, which indicate deeper sleep.
4. D - moderate deep sleep. At this stage, fast waves are recorded on the EEG, which indicates deeper and more restful sleep.
5. E - deep sleep. At this stage, extremely small waves are recorded on the EEG, which indicates deep and prolonged sleep.

Monitoring your sleep can help improve your overall health and quality of life. For example, a person can use various techniques such as meditation, yoga, deep breathing, etc. to help themselves fall asleep and sleep better. It is also important to monitor your sleep schedule, going to bed and waking up at the same time every day so that your body can get used to this schedule and fall asleep easier.

If a person has trouble sleeping, he should consult a doctor to determine the cause of the problem and select appropriate treatment. Your doctor may recommend changing your sleep patterns, using sleep monitoring devices, or prescribing medications to improve your sleep quality.

Sleep (from the Old English sēl, sæl - to sleep) is a physiological process in human life, characterized by periodic depression of consciousness and brain activity. In this case, there is usually a decrease in the reaction to the outside world, which indicates a lack of connection between the brain and the surrounding reality. However, this phenomenon is important for the normal functioning of the body: it is at this moment that incoming information of sensory origin and feedback from the outside world are processed and processed. Thus, sleep is a decrease in a person’s performance that periodically occurs during wakefulness under the influence of nervous processes that regulate his basic functions.