I guess babies are all different! My nearly 2 year old was waking up at 5.30 am all of last week - last night I put her AC on for the first time this year (I put it at medium) and yay - 7 am wake up! My 4 year old doesn't like the AC so much and loves an overhead fan and sleeps better when he's warmer. Anyway well worth a try I say - we are all in a much better mood from not waking up at 5.30 am this morning!!