I worked so hard today. I'm beat.
I can't go any further. I'm dead-beat.
A: Steven. It's ten o'clock, I'm going to bed, I'm beat.
B: Okay. I'm going to stay up a while. I've got to go over the household budget. We've slightly overspent this month.
A: Oh, can't you do it tomorrow? It's already past ten.
B: But I'm not sleepy, darling. I want to finish it today. Goodnight. Have a good dream.