If you have overspent on groceries then cut down your grocery list to the bare essentials. You may not be able to eat steak every night for the rest of the month.
Professor Johnson, last night when I was putting the finishing touches on my paper, a computer failure completely wiped out my files, do you think I can have another day to retype it?
A question such as, "what do you like about the neighbourhood, and what do you want to change?", can take a group a couple of evenings to itemize, condense and prioritize.
Turn your reading light off when taking off or landing at night. Your eyes will be more adjusted to the dark if you have to leave the plane in a hurry.