1. A period from darkness to dawn (relative to "day" and "day"): ~ night. ~ class. It's dark during the day. The days are short and long in winter. 2. Used to calculate the night: three days and three ~. Every day. 3. Last name.

night

It is for people to recuperate and restore energy, and it is for people who are prone to insomnia to think about playing mobile phones. You may have more free time in the evening than in a day, but for insomniacs, there is nothing to do but play with mobile phones, daydream and turn over. Your study, work and reading at night are inefficient and meaningless. Your nerves are excited, but your brain and body are really tired and awake, so it is difficult to do meaningful things at night. Have a good sleep, and you will be energetic to study and work the next day. So please cherish a good sleep and don't be an insomniac.