> This means that if someone who regularly goes to bed at 1 a.m. instead goes to bed at midnight and sleeps for the same amount of time, they can reduce their r

> This means that if someone who regularly goes to bed at 1 a.m. instead goes to bed at midnight and sleeps for the same amount of time, they can reduce their risk by 23%; if they go to bed at 11 p.m., they can reduce their risk by roughly 40%. According to the research, people who are already early risers may benefit from waking up even earlier. For those in the moderate or evening ranges, however, shifting to an earlier bedtime would likely be helpful. Except, correlation does not imply causality. And some people are night owls by choice and can easily change their behavior to conform, and some people have fairly severe sleep disorders and really can't. This is a bit like showing gay and trans people are often depressed, so if you just got them to stop they'd be happier. Complete with a bunch of people in this comment thread who were bi in college and later settled down heteronormatively so clearly everyone else can, too (all the people who were nightowls when they were younger but easily moved their schedule).