Consider whether there is something wrong with your body. For example, have you had any worries, nervousness and dreaminess recently?
The causes of dreaminess include mental stress, excitement, depression, fear, anxiety, boredom and other social and environmental factors, such as excessive work and study pressure, environmental changes, noise, light and air pollution. You analyzed that you were caused by that situation.
I think people should pay more attention to relaxation in daily life, and don't have too much mental stress (of course, sometimes it is inevitable, try to control it).
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