have we set Peter to evil?

The Hippo Gym entertains Peter for 10 seconds, which is exactly enough time for Mama Bear to eat dinner.

Like the Evil Krusty Doll, it seems our baby has two states:

Happy (only observed while sleeping or eating)
Angry (observed at all other times).

That said, I should note that Chompers does sleep through the night, especially now that we've instituted the dim-lights-and-static-on-the-radio regime.