Our oldest (now nearly 7) started something similar just as we were getting him to sleep through the night at the great ol' age of four (years not moths!) . Like the previous posters said: watch what changed.

In the end we linked our son's change with either not going out in the afternoon because of bad weather or some of the TV that he was watching which although we thought was fine, it was a bit too much for him (Power Puff Girls and the like - but you never know what this becomes in their little minds!)

Good luck and good nights.


PS A glass of warm milk ("the special milk for nice dreams") also worked