If it was 39 or over I would take them to the dr's or hospital if dr's weren't open. My ds1 recently had a temp of 39.3 and was showing no signs of being sick but I took up to the local medical centre just in case and it turns out he had a middle ear infection, and he wasn't pulling at his ears or anything! If the temp is going down with the panadol and then going up as it wears off for over 24 hours I would be going to the dr's, you just never know with little ones as they obviously can't tell you when they don't feel well. Hope all is ok!