Delayed Circadian Rhythm Disorder

With delayed circadian rhythm disorder, the pineal gland in the brain releases the sleep hormone melatonin later in the night than usual.  In the morning, the body is still producing melatonin when the body should be waking up – this causes the person to take several hours to feel active and energetic.  DCR is marked by a delay of the sleep-wake cycle as it relates to the demands of society.  DCR may lead to chronic sleep deprivation and habitually late sleeping hours. 

People with DCR commonly have:

• Difficulty falling asleep at night
• Difficulty getting up in the morning
• Decreased energy and alertness early in the day

Bright morning light is the most successful treatment for DCR.  The light will speed up the body clock and restore circadian rhythms to their normal function. Because DCR disorders vary with individuals, the treatment schedule needs to be adapted accordingly.  A comprehensive sleep assessment and diagnosis will guide clinicians in developing an appropriate treatment plan for each individual.

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