You and your husband are upset about something. What advantages are there to sleeping on it?
I'd have to say...none.
If you and your spouse are in the middle of an upset, it's worth the extra effort to try to resolve it before heading off to bed. For a few reasons:
• You'll get much better sleep if the upset is behind you.
• Though some upsets will "fade away" with time, many do just the opposite. They linger and can have a negative impact on other areas of life.
• Upsets (even minor ones) that are allowed to accumulate can put unnecessary strain on the marriage.
• If there are kids, whether they view the upset(s) directly or not, they are affected by them.
Sometimes we're just too tired to sit down and resolve an upset before going to bed, but any effort you (and your spouse) make on this kind of thing can be very helpful. Even if all you do is look each other in the eye and say, "hey, I know we're upset but I think the world of you. Let's agree to fix this tomorrow for sure." — that's far better than sleeping on it. And a fast hug or kiss wouldn't hurt.