This is no Social Crisis... Just another Tricky Day (The Who)
Red - when I'm coming out of it, doing any little thing saps my energy. So I do a little (VERY little) bit and take a nap until I have energy to do more. The next day, if I haven't overexerted myself, I can do a little more and maybe sit on the couch instead of sleeping.
For me, getting things done is a powerful mood-booster.
Also - eating frequent protein and fat rich snacks help with building up energy.