What will vocational high schools check in bed?

Smoking, drinking, playing games and leaving the lights on. Vocational high school has entered adolescence, not only physically but also psychologically. Many students have entered a rebellious period, and the school is keeping a strict watch for their safety. The dormitory teacher will check the bed on time every day to see if there are people who smoke, drink and play games, and whether the lights are on to ensure their sleep time.