The first time you run past your previous stopping point without feeling winded is paradigm-shifting. It feels like freedom from a self-induced body prison.
There's many myths that have been spread around for years in regard to sleep. Hearing the debunking of some of these may be quite a comforting relief to you.
I used to think this would be the best excuse to get out of gym class in school, but apparently science says that you can actually be allergic to exercise.