Morning Lark, Night Owl or Hummingbird?
20% of the population are morning larks, (wake up before 6 am without an alarm; to bed by 9 pm)
20% are night owls (often to sleep after 3am and up around 10 am)
60% are hummingbirds (somewhere in between)
Source: John Medina, BrainRules.net
