Physiologists say that for an adult a healthy sleep should be approximately 8 hours a day. Although, with the modern furious pace of life, many of us will find it simply not permissible to spend so much time in bed, but such a figure is conditioned by nature itself. It is this length of sleep of an adult person that makes this rest really healthy.
Why is sleep so important to a person? The fact is that during sleep, the most important for our health recovery processes that allow a person to remain functional even after the most severe physical exertion. For example, during sleep in our body, the synthesis of adenosine triphosphate (ATP), which is one of the basic substances of energy metabolism, is intensively occurring. During wakefulness, the synthesized adenosine triphosphate acid is cleaved in the cells of our body, thus releasing an amount of energy that is much higher than the amount of released energy in the usual biochemical reactions. Therefore, how many hours a person's healthy sleep will last, ATP will be synthesized so much. Even in this one and only example it becomes clear why a person becomes very tired when he reduces his sleep time, quickly becomes tired, does poorly even with simple assignments at work.
Proceeding from the above, any adult, wishing to stay healthy, should pay great attention to how many hours his sleep lasts. For a good sleep, it is best to create the most favorable conditions - for example, in a bedroom, the air temperature should not be very high. To control this indicator in the bedroom there should be a room thermometer, with which you will always know how many degrees of heat in the room for sleep. It is advisable to ventilate the sleeping room before going to bed. This will allow a little lowering the temperature of the air and simultaneously increasing the oxygen concentration during the hours of sleep in this room, which is also important for ensuring a healthy rest. In the warm season, you can even leave the ventilator open all night long - this will always maintain the oxygen level in the bedroom at the proper level and, moreover, will have some hardening effect on your body. If you are resistant to colds and already have some level of hardening, you can try to leave an open window in the bedroom in autumn or even in winter (of course, keeping in mind how many degrees of frost in the street - at a very low temperature, the window leaf is better closed). Such hardening procedures during sleep will only have a positive effect on a healthy adult, but for children and adolescents, such hardening sessions should be much more cautious and not expose their body to very low temperatures.
The recovery value of sleep has now become so obvious that in some large corporations, workers are allowed to drowse for 15 to 20 minutes after dinner break, right at the workplace in a specially designated room, where soft and comfortable furniture is located. It turns out that even after a fifteen-minute sleep, a person's working capacity is significantly increased, so a rested worker is able to perform a much larger scope of tasks.
Thus, I hope that none of you will have any doubts when answering the question, how many hours your dream should be, so that he could rightfully be called healthy. After all, a dream for any adult is an opportunity to be healthy, maintain a cheerful mood, high performance and low fatigue.