Shark, alive

The cat hates to sit still.
She always manages her time thusly, so that she won't have a single moment to sit still and do nothing.
Relationships, one great man has said, are like sharks.
They have to constantly move, otherwise they die.
The cat thought the same thing about life.
But then of course, fate intervened.
Now, locked in bed for a whole week, the cat realises she is not a shark.
Staying still a little, won't kill her.
Will it?