A nice overview of the sleep process. There is information on the stages of sleep and the reasons why we sleep. The site also has a few surveys you can take to compare your sleep experience to others.

Answer this five-question quiz pertaining to the passage "Observing Patients in a Sleep Clinic."

Answer these four questions about your sleep habits, then see a graphic representation of your natural circadian rhythm of alertness and sleepiness over a 24 hour period.

Have you had trouble sleeping lately? Come and see why that might be and some solutions to this problem. This site also includes some fun facts about sleeping and links to related sites.

Comprehensive multimedia learning unit in Psychology covers states of consciousness including sleep, hypnosis, circadian rythm, and major drug classes.

If you have ever had to adjust to a new time zone, you have noticed that it takes a while before you start to feel normal again. By shifting your sleep and activity schedule, you have altered the pattern of your body's circadian rhythms....

A thorough summary of the parasite which causes African sleeping sickness. Topics include agents of transmission, geographical distribution, symptoms, life cycle and treatment options.

Explore different types of cycles in animal behavior.

Article reports on a recent study which found that people who spent a week in the woods experience a shift of two hours in their internal clocks. Includes a list of vocabulary words from the article.

Witnessing changes that take place on your body can sometimes be a confusing experience. Are the changes normal? Are you changing in ways unlike anyone else? This site may help to relieve some worries that an adolescent may be pondering....

Explore the human body's need for a normal cycle of dark and light and apply this to an understanding of biological clocks in other animals. Test the effect of light on the development of mealworm larvae into adults.