If you're one of the 60 to 70 million Americans with a sleep problem, there's a good chance that a sleep myth or two may be keeping you up at night—or leaving you exhausted during the day. Before you invest in a new $1,500 mattress or spend a couple of nights wired with electrodes in a sleep lab, see if you can trace your sleep troubles to one of these widely believed myths. Then try our tips for better sleep every night.

http://health.msn.com/health-topics/...make-you-tired

[Perna]

I only partially understand about the napping thing; I've experienced both the short, pick-me-up nap and the longer, groggy nap but if you "need" the longer nap because you're short on sleep. . .?