I am totally jealous of parents who have kids who sleep until 8 or 9 am or have to be woken up for school. Nope, not my kids. They are 5 & 8 and they get up at 6 or 6:30 everyday, regardless of when they go to bed.
They sleep in their own beds at night but at some point in the middle of the night while we are sleeping one or both of the finds their way into our bed - EVERY night. It drives us crazy. We have told them time and time again -- "If you wake up in the middle of the night, go to the bathroom if you have to or go get a drink of water and go back to bed" It never works. I am usually carrying them both back to their beds. I don't feel punishment is needed they aren't misbehaving and bribing them probably won't work. At 1, 2, 3 AM I am sure some bribe is not on their mind, their too tired. it's just become a habit - a very hard habit to break.
Right now it's 7:35 here and they are outside playing while dh is waxing my car. Dh is usually outside early doing the yard or random stuff outside and they will go play out there.