bedmate

noun

1. A person with whom one shares a bed.

   “Catherine of Aragon: wonderful woman, the Queen of England, the bedmate of Henry VIII - that much I knew already.”

   “These [periodic leg movements] may awaken the sleeper, but often they do nor and are more disruptive to the bedmate. If you or your bedmate experience either of these disorders, talk with a sleep specialist about possible treatment”

   “She wondered where his thoughts were and whether she was anything more to him than a bedmate and housekeeper. She worried whether she'd done something to be the cause of his gloom...”