I've been tying the door shut for over a year now. It's done in such a way that I can open it easily, like if there's a fire, and I'm a little concerned that I'm used to it enough that I'd open it easy enough, even if I was sleep walking. But, I probably wouldn't tie it back SHUT in my sleep, so at least I'd know in the AM that I was sleep walking. I like your tape idea! It wouldn't be practical for me. I rarely sleep straight through the night. Sometimes, if I'm having trouble getting back to sleep, it helps if I get up and walk around the house. I think I'd use up too much tape! :)