Because the circadian rhythm controls the sleep/wake cycle, circadian rhythm disorder often results in insomnia. If there is a pattern to the sleep disturbance, i.e., one consistently wakes up or falls asleep at the wrong time, or if he
Because the circadian rhythm controls the sleep/wake cycle, circadian rhythm disorder often results in insomnia. If there is a pattern to the sleep disturbance, i.e., one consistently wakes up or falls asleep at the wrong time, or if he/she cannot get to sleep at certain times, it is most likely that his/her circadian rhythm is malfunctioning.
The American Academy of Sleep Medicine (AASM) estimates that 25% of all sleep problems are directly related to circadian sleep disorders and several other sleep problems are either caused by or contribute to circadian rhythm disorders. These sleep disorders include late night and early morning, insomnia, interrupted sleep patterns, free-cycling sleep disturbances and irregular sleep disorders. (For specific information on all circadian related sleep disorders, visit the sleep section on this webpage.) The two most common sleep problems—Late night and early morning insomnia are discussed below.
Late Night Insomnia
The majority of people with sleep problems experience difficulty being able to fall asleep. They may only experience a few hours of sleep each night, and feel worse in the morning time. In this case, the body clock is running slower than a normal circadian rhythm (24 hour period). The clinical term for late night insomnia is Delayed Circadian Rhythm Disorder or DCR. DCR sufferers’ body clock doesn't 'wake up' until later in the morning or day. They have difficulty getting started in the morning, may feel a bit groggy or down during part of the day, and may experience a second wind later in the evening. Those with DCR are often referred to as night owls, and find it easier to stay up late at night.
With DCR, the daily cycle, or circadian rhythm is running slow, and the pineal gland releases the nighttime hormone melatonin too late, causing sleep to occur later. In the morning, the body clock is still producing the nighttime hormones. This is why it may take several hours to feel active and energetic. Because DCR sufferers don't receive the proper amount of sleep, energy, alertness and ability to function may also be diminished.
Because DCR is the result of a slower circadian rhythm, bright morning light is the most successful means to speed the body clock up and restore circadian rhythms to their normal function. Because DCR disorders vary with individuals, the treatment schedule needs to be adapted accordingly. Apollo provides an effective assessment tool on its website for determining 