My wife and I started to notice that we were meeting each other in the middle of the bed at night.
Not necessarily a bad thing, but when it's not intentional, it becomes an issue.
After doing a little looking around I realized that the thin plywood being as the mattress base used was bowing in the middle. It had plenty of bracing and support for front to rear but not so much left to right.
So I installed a 2x6 across right where the pass through meets the under bed portion of storage.