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Yes, you can.
It all starts with the process of falling asleep, during which the person is still awake. There is yawning, a decrease in the level of attention, dryness in the eyes and mouth, a decrease in the sensitivity of the sensory organs.
Immediately after falling asleep, a slow-wave sleep phase follows, which is also called orthodox sleep. This phase is divided into 4 stages:
1) The alpha rhythm of the brain decreases, but the theta rhythm appears. Muscle activity is also reduced, the respiratory rate and pulse rate are reduced, dream-like hallucinations appear, the metabolism is slowed down, the eyes can make slow movements, and the body temperature is lowered.
2) Shallow or light sleep. Characterized by a further decrease in muscle activity, a decrease in body temperature and heart rate, the eyes are motionless. The EEG shows “sleep spindles” -sigma rhythm. At the moments when these spindles appear, a person is completely passed out, and between them (approximately 2-5 minute breaks) it is easy to wake a person up.
3) The third stage can be attributed to both the second and fourth, it all depends on the number of delta vibrations: if they are less than 50%, then this is still the second, if more-then the fourth phase, which characterizes
4) the deepest and slowest delta sleep. At this time, it is very difficult to wake a person up, it is during this period that approximately 80% of all dreams occur, sleepwalking, talking in a dream, enuresis occur, but the person does not remember anything.
The process of falling asleep can be accurately tracked on an EEG (electroencephalogram). This is a graphic characteristic of the brain, which displays rhythms (they are named like the letters of the Greek alphabet: alpha -, beta -, gamma -, delta-and so on) in the form of curves, each with its own characteristic features.