Bella has to have her naps too. During the week while we are working she sleeps most of the day and at night she is just full of energy. On the weekends her schedule gets completely messed up. After 10:00-11:00 a.m. she is just worn out. She will follow me around the house plopping herself down whereever she can to catch a few winks.
Once I took her with me on an all day shopping trip to Miami. On the way home that night she was so grouchy. She kept trying to sleep and my other dog, Chloe, moved beside her and Bella flipped out and tried to attack her.

That was completely unlike Bella. I think she was totally sleep deprived.