Why is it that on the days when you want them to have a short nap because you have places to go and things to do they sleep for over an hour and a half, but on the days when you would kill for them to have a nice long nap so you can do (fill in the blank here), they nap for about 30 seconds??

Why?  Anyone?  Bueller?  Bueller?  Anyone?

Seriously, I don’t get it.