Is there a word?

Is there any word that means exhausted on top of exhausted? What a week it's been . . .I don't think I've slept much over the last 4 or 5 nights. Darby is definitely sick and last night her fever was pretty high and she didn't sleep great. Trevor also has something, no fever, but very congested so he didn't sleep great either. Therefore, Erich and I didn't sleep . . . ah, don't the kids understand by now that mom is a much nicer person after she's gotten some sleep? They'll learn that soon enough, today probably :) I need a sign around me that says "beware of the exhausted mom" but actually I don't think I need a sign because it's fairly obvious in my appearance . . .looking lovely today.