How to keep a cage comfortable at night?

I have several cages ranging from standard to flat to negative. I’ve tried metal and plastic cages, and ones with and without elastic belts. I can wear them all day with no issue.

At night, however, I’ll wake up after a couple hours in pain. It seems that whenever I get a nocturnal erection, it pushes the cage out to where it’s tugging on my balls. Even the ones with elastic belts that are supposed to keep the cage flush with the body aren’t enough to prevent this.

Does anyone know how to combat this? I’ve tried just about every cage design imaginable. None stay in place.