Okay here is the situation.
I will admit that I enjoy playing with Dortmund on my bed. I have a little tunnel set up for him to hide/run through. And before he gets tired he usually spends a couple of hours doing zoomies and binkies across my sheets while I'm trying to fall asleep next to him. Usually he tires out and will cuddle up next to me and let me scratch his head and ears. I've learned to sleep to one side and he gets the other 2 thirds.
About a half an hour I was laying there trying to fall asleep and Dortmund was running around crazily. I felt him jump up onto my legs and then crawl down the other side where there was only a narrow bit of bed left over. A couple seconds later he slipped off of this narrow precipice and fell the two feet to the floor.
This time it was clear he wasn't hurt. I watched him quickly switch into investigation mode and he began exploring the floor of my bedroom. Every time I tried to scoop him up he hid under my bed, and then found his way out another side to explore my piles of dirty laundry, my USB cables, the boxes of Hay I keep for him, the underneath of my dresser drawer. He was having so much fun that he wasn't even responding to dried strawberries. I finally corralled him and put him back in his cage about 5 minutes ago.
Which leads me to a problem. I like playing with Dortmund on my bed. I can lay down and read or just curl up when I'm depressed, and usually he just flops down near my left hand and lets me pet him, sometimes for hours. But if he is going to keep falling off...
Part of me just wants to let him explore, but that would require a massive cleaning / rabbit proofing (something I've been putting off) but it doesn't solve the issue of falling off the side of the bed. Dortmund has a lot of energy. Sooner or later he will tumble again. I could surround my bed with X-Pen but that seems confining to me. Or I could just get rid of the Bed Frame and put my mattress on the ground. Or I could just accept that beds are no place for rabbits to run around and confine Dortmunds limited freedom to the small run I set up in the living room.