Sharing a bed with someone is like a war that is fought entirely by special ops agents who act out in the most deviant ways possible. Their methods for gaining the upper hand are based around dirty tricks and propaganda delivered in nightly air raids. If you’re lucky you have a larger military force on your side than your partner.
Even the whole concept of sleeping in a bed suggests different sides. His side, her side; his lamp, my lamp; his corner, my corner! Mine!