This is a question I've had for years: Does time of day matter for sleep? If I go to sleep on a "normal" schedule (wake up, start day around 7am), I need 8 hou

This is a question I've had for years: Does time of day matter for sleep? If I go to sleep on a "normal" schedule (wake up, start day around 7am), I need 8 hours. However, I can totally survive, and even thrive, with just 5-ish hours of sleep, if I can wake up around 11am, going to sleep just before dawn. Not a doctor, so I don't know the answer. My assumption is that it depends on the person. I'm a night-person, so naturally the waking-at-11am schedule works best for me. But staying awake until 5:30am is unthinkable for most morning people.