<human>: My wonderful gem of an SO and I don't live together, but end up sleeping in the same place at night probably five or six times a week. Each night we fall asleep on our own halves of the bed, and sure as shit after eating Taco Bell, each night around two am I'm telling him to move back over, because he is spread eagle taking up the entire bed and I've been exiled to the six inches at the edge. He moves back over, and then I once again find myself peering into the crevasse that is the space between my bed and the wall a few hours later. This happens every time we sleep together.

We're not large people, both on the lower end of normal weight ranges, and before he falls asleep, we're both quite confortable on our respective sides. I've talked to him about it while he's conscious and he feels bad and doesn't mean to do it, but then he falls asleep and goes right back to it. How do I combat my boyfriend's nighttime quest for manifest destiny?

Can you condense the text into a few key points?
<bot>: my boyfriend tries to take up all the space from sea to shining sea in our bed while he's asleep. Obviously this keeps me from sleeping well. How to fix?