How much sleep do we really need?

To maintain blood pressure within the norm, it is recommended to sleep for 7-9 hours a day, said scientists from the University of Arizona.

They conducted a study with 300 people aged nearly 45 years. All of them were wearing devices that measured blood pressure every 45 minutes. At night, participants in the experiment wore special sensors that recorded the parameters of the body in different phases of sleep.

As it turned out, people who has not much of sleep, had increased systolic pressure. At the same time, the participants, who went to bed with high pressure, but slept well and for at least seven hours were in good condition in the morning.

Experts also highlighted the importance of sleep in total darkness, turning off all gadgets and curtains windows. According to scientists, excessive light in the dark disturbs the production of melatonin, shifting it to a later time - as a result, sleep does not occur in the prescribed hours. Before going to bed you do not need to be in a brightly lit room, the light in the room before bed should be soft and diffused.

Another study showed that in order to maintain the beauty, it is necessary to sleep 9 hours and 10 minutes.

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