I'd hold on to them unless you're in financial need. Yes, your neighbors have lives and needs; but so do you and they can;t expect you to change your lifestyle just to accommodate their schedule. I mean, no one wants to be the ass-next-door, but you have the right to enjoy your music during normal hours (i.e., before noise ordinances kick in). As long as you're being reasonable and showing that you're trying to take your neighbors into consideration, right?
It's not your fault they have odd sleeping hours.
It's not your fault they have odd sleeping hours.