Insomnia

Insomnia is the most common sleep disorder. Insomnia is defined as a recurrent problem initiating sleep, maintaining sleep, and/or waking up feeling un-refreshed, and is associated with problems functioning during the day. Daytime consequences for insomnia include irritability, fatigue, and inattention. The sleep field currently recognizes approximately 30 types of insomnia based on the presumed underlying cause for the sleep disruption.

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Circadian Rhythms

What makes one person greet the day with smiles and energy, and another hide under the covers until the last possible moment? It's a combination of genetics, the environment and our lifestyle choices, says sleep specialist Mark Wu.
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Sleeping by Example: Interview with Leading Researcher and Johns Hopkins Neurologist, Dr. Rachel Salas
http://www.thepatientpromise.org/blog.html

A new study's surprising news about how many Americans sleepwalk

Probing the Mysteries of Brain Injury and Sleep
Find out how Hopkins researchers are investigating the brain pathway problems related to traumatic brain injury and insomnia