Why does my cat sleep so much?
Science is still learning the answer to this! But put simply, the designers of the universe, for budgetary reasons, offloaded much of the heavy quantum processing necessary to model physical reality to cat brains. Your cat is literally dreaming the universe (including you).
This is why it is not wise to wake a sleeping cat. Each time you do, some data is erased from the universe; that's how black holes form, and also why you only dimly recall the Berenstein War.
@natecull wasn't it beranstain?