It's hot here when we put bub to sleep but it does cool off during the night so I need to put him in something so it's just a short sleeved short leg onesie. He wont sleep in a bag or with ANY covers on him! When it's been cooler we have to make sure he's totally passed out before we put the covers on or he will wake up. Even then as soon as he stirs he kicks it off. We were never able to swaddle him either. I'm hoping by winter time he will be a bit used to it other wise he'll be going to bed in a full long sleeved, long legged inbuilt bootie outfit which is really warm otherwise our little man will freeze