I wish I found this thread at 10.30pm the other night when I was trying to figure out why the alarm was not working!!
However did work out that it was the fan and have since turned it off while bubs is in his cot.
But what doyou do when the weather is hot and bubs room reaches 27?!?!?!?

Anyway will take of his mobile and turn the fan on and see if that works.