I feel the same. I just came off a hypomanic episode. I was working crazy hours, making tons of money, had extra energy and motivation, didn't need much sleep. It was great, I was so productive!
Now I am mildly depressed. I am sleep 10 hours, sometimes more, catching up from the hypomanic sleep deprivation. I have very little motivation, I can't even do the dishes lately and they are piling up.
It is pathetic. Just a few weeks ago, I was superman, and now I just feel like a slug. I miss the energetic man I was before.