Sam we have a 1 Tog grobag and the warm nights Sophia has been just in shorts arms / legs and a singlet under it, but the last few nights she has worn a singlet and a bonds long arm / leg light stretchy - but with her looooooong legs the legs only go to her knees.

Babies will wake when they are cold so if he seems happy don't worry too much about it. Oh and I find the gro-bag helps stop the feet getting stuck between the bars of the cot too!