Sleeping

When your Lust bar (top left) is empty, you should either call it a day and sleep at the Ranch or refill it with by winning surprise sex. (Note that if you keep at least 50 Lust, you can choose who to initiate Surprise Sex with, while if you have 0 you'll be forced to wait until the Wild Nephelym randomly initiates either Surprise Sex, for any Breeder, or Surprise Blowjob, for a male or futa Breeder.)

When you sleep time skip to 12:00 the next day.