We are about the same as Kirsty, Jackson sleeps in a singlet, then flannelette PJ's and ankle socks a 2.1 tog sleeping bag and a cot blanket over the top of that. Lately our house has been dropping to under 10 degrees at night, so we leave the ducted heating on about 12 degrees. Jackson is a real sweaty baby, if he slept in an 18 degree room, I think he would melt!