Ok so you have been at a party and stayed away from the alcohol but have treated yourself a little to much and over eaten to the point where it makes you throw up the food has been in your stomach for at least 4 hours would you re-eat something small just to make sure you don't hypo during the middle of the night or leave it?
A bit late now, but if the food has been in your stomach for 4 hours then they'd be no reason to eat again, but much would depend on your bg levels before going to sleep, if they were on the low-side then it would be wise to have a small snack.