Just go to bed! Seriously, you are TIRED! Who cares if it’s only 9:30? Your body is telling you you need sleep.
LISTEN TO IT.
Anyway, of you try to keep yourself up any later you are just going to snack your way through the night. Is it really worth it? The posts can be written tomorrow and the emails aren’t going anywhere. Go to bed early and hit the ground running. Your body will thank you for it tomorrow.