Over millions of years of evolution, the human body has developed its internal biological clock, which regulates the circadian cycle through melatonin. While today, due to technological progress, we no longer need to go to bed at dusk and wake up at dawn, our biological clock still plays a very important role in helping us sleep comfortably.

Darkness is crucial to the proper functioning of the human internal clock because it is in darkness that more melatonin, the “sleep hormone,” begins to be released. This is a relaxing and calming compound that prepares the body for sleep. When less light enters the eye retina, melatonin production increases. The same thing happens when more light begins to appear – the level of melatonin decreases.

That’s why it’s best to sleep in the dark because that’s when the body is biologically prepared to rest. However, we don’t always go to sleep in complete darkness. That’s why it’s worth considering additional aids.

To sleep in the dark, you can use: • night curtains for windows; • window blinds made of darkening fabric; • a sleep mask for the eyes.

Of the above options, a sleep mask for the eyes is the cheapest and easiest to use because you can use it anywhere. It’s convenient not only at home but also when traveling on a plane, bus, in hotels, and in many other situations.