Sorry to hear that.
I expected to be useless today, but got through the teleconference in good order, then went off to the library to finish my presentation. I expected to be out most of the afternoon but was done in an hour and a half. Yay!
But I probably won't be long for the world tonight, which means I'll probably be up too early again tomorrow.
When you feel sleepy, get up and walk around. Find something to fiddle with; get a snack; check to see if the porch light is on; make sure the books you haven’t read are really the ones you want to read; reassess your address file....
Some days/nights, I have to force myself to stay awake, and unless I get up, physically, there is no way I can make that happen.