"Is the cause of the environment, has nothing to do with psychology, in the dark environment will produce the feeling of fear. In our daily life, children may cry because of fear when they sleep at night, and only when the light is on will they sleep. This happens mainly because they are afraid of dark scenes, but it also exists in many adults. One way is to adjust yourself, such as finding more friends to talk to, diverting attention, working regularly, giving yourself good psychological hints, listening to light music, and participating in some aerobic activities when necessary. "