Systematic lack of sleep can cause depression and unmotivated anxiety. May keep you awake without coffee or other energy drinks.Ī sleepy person is sullen, irritable and distracted, he has a pale face with dark circles under his eyes and lowered corners of his lips.

The simplest and most reliable indicator of the quality of sleep is well-being. There may be significant deviations within each age group, associated with personal characteristics and the needs of the body. So, babies sleep until 17-18 hours, children and adolescents - up to 10-11 hours, the norm for most adults is 7-8 hours of night rest. Over the course of a lifetime, the need for sleep changes. The body temperature and pressure rise, the heartbeat accelerates.

During REM sleep, a reconciliation of all body systems occurs, at which time a person usually changes body position and may even mutter.

This is a period of rest and recuperation. The sleeper's blood pressure drops, slow movements and fading of the eyeballs are noticeable under the eyelids. This phase is characterized by even breathing and relaxation of the body. It is known for sure that sleep consists of two alternating phases - REM sleep lasts about 10–20 minutes, slow sleep approximately 1.5–2 hours. As a result of numerous and in-depth studies, somnologists, neurologists, anthropologists and scientists of other specialties managed to establish an unambiguous connection between good sleep, well-being and the state of human health. We spend a third of our lives sleeping, which is a compelling argument in favor of a responsible attitude to sleep problems. An adult is recommended to sleep from 8 to 10 hours a day, but morning vigor depends not only on the duration of a night's sleep.

Sleep Calculator is a useful service that can determine the best time to fall asleep and wake up.

When should i sleep calculator