Silly question, probably with an obvious answer I'm overlooking... But when you're co-sleeping, and one of you has to get up in the morning (i.e. for work), how do you wake up without waking baby up?

I realised this morning that even when DH has his alarm set on a very quiet setting, if I'm not in deep sleep, it wakes me up (but usually not him, leaving me to shake him awake anyway ). I can only assume it'll wake the baby up too if they're in bed with us.

How do other co-sleeping mummies and daddies get up for work without waking the little ones?