Bed Time

I don't know what's up with these kids, they used to go to sleep at 7:30 PM, now it's almost 9:30 and they are still running around, even after we bathed them, dressed them, fed them, read to them. I don't know where these kids get all that energy from.

Any ideas? My cousin recommended this book to me. But pretty much all it says is that I should follow a routine, and we are doing just that, but the kids somehow fell out of that this week. I wonder what could have caused it. This week is no different than any other.