Ever notice how depression affects you physically?

I'm a horrible insomniac, but especially when I'm depressed (like now). I drag around with no energy, feeling like I weigh 1,000 lbs. I'm dragging (shuffling) my feet. Everything seems like too much effort. No stamina. Walking feels like I'm trudging through deep mud.

Just, overall, I feel like I've been hit by a truck.

I wonder if I'll ever feel so light I could fly?