With our first, DH used to wake up all the time but he wanted to help so it didn't bother him. After a few weeks he just stopped waking up when Moo cried. Used to amaze me that a baby could be crying a metre away from him and he wouldn't even stir I would turn the TV on and bedside lamp and he would still sleep through it all.

With our second I don't think DH has woken up when bubs has once. I turn on the bedside lamp everytime I feed, slept with it on for the first month as Buster is in with us and I wanted to be able to see him.