Imagine you got a rough night of sleep. Perhaps you went to bed too late, needed to wake up early or still felt tired when you woke up from what should have been a full night’s sleep.
For the rest of the day, you feel groggy and unfocused. Things that are usually fun or exciting don’t give you the same level of pleasure. You don’t have energy to exercise, so you avoid it. You don’t feel motivated to see...