You talk in your sleep.
Not any more but I used to until my late teens.
You walk in your sleep.
Your SO can fall asleep easily.
Your SO sleeps on his back but you can't.
Your SO snores.
"Show a dog an ounce of love and he'll be your friend for life." ~ Stuart and Linda Macfarlane
Your SO sleeps closer to the bedroom door.
Your SO often falls asleep watching television.
You will forgive me if I close down for the evening?