Sleep is a biological need for all living things. In the evening, fatigue develops as a result of the waste of energy during the day, as well as the release of melatonin, a hormone that regulates the cyclicity of our body's processes. This hormone is secreted by the pineal gland, an endocrine gland located in the brain. Ideally, we should sleep 7-8 hours a day, this is how the effect of hormones is calculated. Unless, of course, something unexpected happens, because of which we wake up. After waking up naturally, it is difficult to fall asleep again, even if you stay in bed. This indicates a decrease in the release of melatonin.
For an adult, 7-8 hours is a sufficient sleep period. Children and adolescents are encouraged to sleep more. Recent studies have found that adults, especially older people, who sleep more than eight hours a day, are at risk of developing cardiovascular disease. The paradox is that getting too much sleep is almost more dangerous than not getting enough sleep. One of the possible reasons for this is that an excessively long stay in bed in a horizontal position does not improve the functioning of the body, which needs movement for normal breathing and blood circulation.
Nevertheless, it is worth treating with a certain skepticism to such studies, since they are most often based on subjective data reported by the participants in the experiment. People may not always remember with certainty how many hours their sleep lasted. As with everything that concerns the basic parameters of our life (food, water and even oxygen), an individual balance is required. Any systematic deviation from the basic needs of the body is dangerous.