My kids don't. DD has done it before, but not regularly. She is 26mths old now. She still wakes at least once. Usually twice for her dummy or for a drink. DS has never slept through more than 6hrs straight, and that has only been a few times. Last night I was up 5 times with him. He had 3 full feeds over night and was awake for a party at 2am, for an hour. We bf and co sleep so I get as much sleep as I can. We are having a tough time with sleep at the moment between teething and growth spurts, more than 3 hrs straight sleep is rare in this house. I'm tired. But I love sleeping with my kids. They are little for such a short time and in the long run these 3-4 years will seem like nothing!