We have decided against making this an issue in our house. We have had a cot next to our bedwith 1 side off for about 9 mths, now we want both boys out of our bed and so we talked to them and got a bunk to replace the cot. Big boy upstairs and little boy downstairs. Its against a wall and our bed. The little 1 knows hes not allowed to climb up by himself (but he does sometimes) We put them in their places at the start of bed but while we are in the early stages we wont fuss if 1 falls asleep in our bed or his brothers bed, we just put everybody in the right place when they are asleep. So far its working well, and we hope that next summer they will go into their own room, but for now, just having our bed to ourselves is bliss!