The neighbors upstairs and across the hall really need to change the battery in their smoke detector. It gives off a reminder "beep" every minute or so. It's very faint, but it keeps me awake at night. Shannon doesn't hear it at all, no matter how many times I make him stop whatever he's doing, throw open the door and say "THERE! Did you hear it that time?...okay wait a minute....THERE! THERE IT WAS AGAIN!"
Meanwhile, I slept through this.