Nightlight At The End Of The Tunnel

My boyfriend thinks there's something wrong with me because of how much I sleep. I've always needed to sleep a lot (like, nine hours). I've been tested for everything, and I'm fine. Do some people just need more sleep? How do I get him off my back?

--Duvet-Covered

Okay, so you're the love child of Rip Van Winkle and a log.

Studies on identical twins suggest that our "sleep duration" (how long we tend to sleep) is between 31 and 55 percent "heritable" -- which is to say factory-installed, dri...