I definitely feel that as someone who's usually for something, either a bike, run or triathlon race, I'm tired a lot. When I (rarely) take a step back from it allI find I sleep better, feel more energized, and feel in general peppier and happier.
Alas, I know that's really a short term illusion. I only feel so great when doing nothing because I've put in the hard work to enjoy that quality of life when I kick back. Give me a year or several at that relaxed state, and health and weight won't be so good anymore.
You're a lucky one in that you had to force feed yourself to maintain weight - for most folks, myself included, the moment I stop working out, my weight goes up. Heck, even while doing 18hrs of week of training, I was still 20lbs heavier than I was in college. (Not all fat, but definitely not all muscle either.)