What are the different phases of sleep characterized by?

The phase of slow sleep is a state of deep rest, and during the phase of REM sleep, the rhythm of respiration and heart rate increases, metabolism intensifies, and a person sees dreams at this time.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.