Sleeping in the same bed = bad sleep

The thing is, me and my boyfriend sleep at each other's sometimes and when we do, we both sleep pretty bad, especially him. During the last weeks I've got used to it and sleep much better but he hasn't. I've noticed that when he sleeps alone on his bed, he... erm, well, sleeps very funnily. He just takes over all the bed, legs spread, arms spread or as I call it "cross sleep" from one extreme of the bed to the other. When we sleep together, obviously he has so sleep "straight" or he'll kick me out xD so apparently he sleeps very very bad. Has this happened to any of you? and if it does, is there anything we can do or is just a "get used to it?"

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