11 sci-fi stories that show what goes wrong if you sleep too much

Most of us get pretty cranky without enough sleep—and Healthy Week at NBC Universal is here to remind us that sleep is a good thing, But there is such a thing as too much sleep, especially in sci-fi. Sadly, that's where these folks come in.

The old cliche of a main character falling into a coma or coma-like state is pretty common in fiction, and has been done to death more than a few times. But there are a few coma story lines that still pack a punch.

Sleep is healthy, folks, but too much sleep ... not so much. Let's try to keep everything in moderation. If not, well, you might just end up like some of these guys.

[Warning: Spoilers ahead!]

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