Professor morooka works 60 hours a week for 9 months of the year. during this time he longs for a break. when he finally gets a break, he misses the sense of accomplishment he feels when he is working. theory suggests that this is because there is an optimal level of arousal that we all try to maintain.

Arousal. When working a lot, we are in a very high state of arousal. The whole body is focused on doing a good job, concentrating energy and creating new one. At the times of the break, the body is still expecting to have the normal kind of workload - if this is missing all of the sudden, some people tend to get very tired, demotivated and / or dissatisfied.

Because without physical activity, the body has extra "energy" if you will, and so when it is time for bed you are not tired, so you end up staying up all night. also there is probably an effect on your internal clock, which messes with your melatonin production which goes hand in hand with your sleep cycle

The answer is corticosteroids