Mine don't wake me up, but if they see that I am awake, they will lay beside purring, until I get up and feed them.

Purring is a cat's way of getting attention. Maggie (RB) purred in my face for 30 minutes at 4:00 AM once. It seems she had eaten the dry food bowl down and wanted more. Once I fed her she left me alone to go back and sleep.