When I have had weeks of great thyroid insufficiency, I have something that looks kind of like Depression, and actually it is the body conserving energy for essential functions. During this time, I simply cannot move my body to do what is important- because every task is assumed equal importance, and the one (whatever) I'm doing is perceived to be the easiest to continue. This can lead to overeating, oversleeping, over-reading, over-surfing the web, etc. some more benign than the others, but anything really important falls away.