The boss’s sleep quality affects not only the boss’s self-control the next day but influences employee outcomes as well, reports the Harvard Business Review.

Historically, this research has depicted abusive supervision as stable over time. In other words, the previous assumption was that some bosses are jerks and some are not. But recent research indicates that the same leader can be abusive on one day and nice on another day. The differences in the same leader across days are actually bigger than the average differences between leaders. This means that leaders who are often jerky still have days in which they are nice, and leaders who are often nice still have days in which they are jerky.