Every weekend or after dinner, falling down on the sofa or bed to watch a movie or TV, presumably the most pleasant time for most people. However, many people have fallen asleep without looking at it, and have even become a habit.

         Recently, some media reported that Professor Rachel Salas, who studies sleep science at the Johns Hopkins University School of Medicine, said, "If you sleep while enjoying the light and sound from TV, you may form a sleep disorder." .

         Salas said, "The sound of movies and the like is unpredictable. The sound volume and interval of the relaxing effect are very stable. If the unpredictable sound enters the ear during sleep, it can cause wakefulness and hinder sleep."

         The blue light emitted from a TV or a smart phone may hinder sleep, because the body can sense the light while closing the eye, and sleeping while watching the light of the TV will have a bad influence on sleep.