Fit people are usually sound sleepers at night
This may put you off a bit but people who are physically fit, well, they tend to sleep at night peacefully. The best thing about it is that they go to deep sleep, the best kind of sleep wherein the whole body is at rest and the muscles can repair overnight.
Now, do you understand why there are people who are insomniacs, have difficulty sleeping or sleep lightly at night? Well, one of the reasons why they are like that is because they’re not in good shape.