Natalia Polovodova, deputy chief physician of the Yamal Center for Public Health explained why it is not recommended to sleep in unshadowed bedroom, URA.RU reported.

The lack of complete darkness during sleep, according to the specialist, may result in the development of cancer. The fact is that when there is light, the human body stops producing melatonin, which is responsible for its biological rhythms.

"If these rules are not adhered to, sleep disturbances will occur, which is a factor in the development of cancer. Therefore, everyone should create all the conditions for sleep," said the specialist.

Neurologist and somnologist Elena Tsareva also reports a link between melatonin disturbances and cancer risk. According to her, sleeping in the light first affects the psyche, then the digestive and cardiovascular systems, and in the long term, the risk of getting cancer increases.