Pad Out Meaning

(idiomatic, slang) to sleep or go to bed

Example:   Some students pad out their essays by adding a whole lot of quotes from random sources.
  Have you heard about girls padding out their bras to make their boobs look bigger?
  Because of my job I usually pad out just before nine o'clock.
  My housemate was very annoyed to find my friends padded out on the lounge room floor this morning.