Get enough sleep.
God designed us to need sleep; it’s a phase of repair and renewal for the entire body. Deprived of sufficient sleep (7-8 hours for most) we don’t think or learn well, and we’re grouchy, both of which negatively affect relationships as well as academics! Going several days without enough sleep lowers resistance, and we’re “easy prey” for the next virus that finds us. There may be times when an “all-nighter” may be needed to finish a project or to sit up with a friend who is going through a crisis, but as a general rule, little productive effort occurs after midnight.