Hands down, the National Sleep Foundation website is one of the best resources on sleep and sleep disorders. Whether it be information on sleep topics, sleep related problems, American polls on sleep, video clips. etc., the site seems to have it all. Unfortunately though, over the last few years, less and less can be found within the website itself and more and more is found for sale at the sleep store.
If you have used items from this site in your class, please leave a comment detailing your activity. The home page for the foundation can be found at http://www.sleepfoundation.org/