Teenagers with strict parents are mercilessly ridiculed for waking up past this time.
Dads use it as a scapegoat to make their kids feel as though they are irresponsible and inadequate adults, no matter the actual bedtime or workload that the child has to deal with.
Son: "Dad, can I go out to Applebees with my friends later?"
Dad: "Fuck no, not when you're getting up past 11:00 AM every weekend! I got up at SIX this morning to drive your brother to his tutor, you lazy ingrate!"