My 16 MO DS has just woken up from his nap with a temp of 39.5. He's not prone to high temperatures - only the second time I've known him have one. He seems absolutely fine in himself. Only other 'symptom' is that he hardly had any sleep at his lunchtime nap (usu has 1-2 hours) in spite of active morning. He's also very red in the face. Should I investigate further, or just whack a bit of Calpol down him for now??