Insomnia
Psychophsysiological Insomnia

Shift Worker Sleep disorder

Delayed Sleep- Phase Syndrome: is a disorder when a person cannot fall asleep at their desired bedtime or have difficulty waking up spontaneously at the a certain time in the morning. Patients with this disorder cannot find a way to fall asleep more quickly, and have a relatively severe to absolute inability to advance the sleep phase to earlier hours. For example a working person who needs to be up at 6 am, needs about 8 hours of sleep and instead of falling asleep at 10 pm goes to sleep at 2 am and therefore has difficulty waking up at 6 am. This results in symptoms of sleep-onset insomnia or difficulty awakening at the desired time. This is common in teenagers and college kids. There are some people in whom the biological clock is genetically delayed and difficult to adust for earlier sleep onset.
Light therapy within 30 min of wake up time will help to advance the sleep phase.

Advanced Sleep-Phase Syndrome: is a disorder in which the patient has the inability to stay awake in the evening and has to curtail evening activities by the need to retire to bed very early or early morning awakening insomnia. Typically such patients experience sleep onset between 6pm to 8pm and wake up early between at 1 am and 3 am. After he wakes up, he cannot go back to sleep. Typically elderly patients have this type of problem and the biological is advanced to earlier sleep onset. Evening light exposure will help to delay the sleep phase to later time.

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