The sleep hormone melatonin is best produced in complete darkness. In a modern city it is difficult to achieve it, even at night the lanterns shine, the headlights from cars, and so on. I put on a sleep mask and found myself in complete darkness. The brain gives a signal to the body - night has come, you need to sleep. Melatonin is released and you fall asleep quickly.
Don't believe me - try it yourself. People who have started sleeping with a mask say their sleep quality has improved significantly.
You will laugh out loud, but, in addition to protection from bright light, the bandage gives the illusion of detachment, some even protection from the outside world, as in childhood - he covered his eyes with his palms, and hid from everyone ...
Personally, a bandage for sleeping came in handy in the summer in Yamal. During the period of sunny white nights, when even the curtains do not really save, she was needed to at least fall asleep. In a dream, she, of course, flew, but coped with the main task with a bang.
Recently I realized the benefits of this thing - I was in the Arctic, there is a polar day and the sun shines at night as in daytime. In this situation, a blindfold would be very useful.
If there is even the slightest light source in the room in which you sleep, then the body stops producing the hormone melatonin. Generally speaking, its main function: regulation of the endocrine system. A deficiency leads to the fact that a person does not get enough sleep, a slowed metabolism (the reason for excess weight, by the way), poor immunity, acceleration of the aging process, poor functioning of the digestive system. In short, I recommend sleeping in a bandage, especially during the white nights.
Try to face the window and close your eyes. Then, with your eyes closed, cover them with your hand. You will see that the light still penetrates slightly through the eyelids. For people with anxious and restless sleep, this is a serious problem.
Thus, a sleep mask saves your communication with Morpheus not only in the situations indicated by Sergey, but also on those days when you want to lie in bed, even if the sun has been at its zenith for a long time.
I often use this device if I'm really tired and want to sleep as much as my body needs without waking up from the first rays of the sun.
It is needed if there are light sources in the room. For example, your laptop is charging and its LED is blinking. Or your relatives can turn on the lights, etc. In general, so that nothing will disturb your darkness.