He was a hot baby, in summer he would wear a nappy and singlet but I would keep a light blanket handy for 3am when I would find him down the bed outside the covers. and in winter he would wear a singlet and onesie to bed and have a thicker blanket on call. DS2 is a cold baby and he wears 2 layers more then me (its winter here) and in summer he wore a light onesie. We also have tried sleeping bags on top of the doona/sheet, worked really well when he was younger but at the moment hes going through a "I must sleep on top of mum or not at all" stage haha