This probably only applies to those of you who have access to your works-in-progress whilst away from the studio;
If I've bounced an idea for a friend to listen to and have access to it on my phone (for example), I won't allow myself to listen to it until I'm back in the studio.
Reason for this, is that if I've had a long break from the tune (4+ hours), I'll usually know what needs fixing/adding the second I hear it back for the first time. If I listen while I'm away from the studio, I might have a great idea and then forget it by the time I get back.
Does anyone else go with this mindset? I would recommend trying it if not. Over-listening to your own stuff sort of clouds your outside vision of it.