Circadian Rhythm (also known as the internal body clock) is a biological cycle which takes place in most living things. A circadian rhythm sleep disorder happens in the system when people either by their own actions or due to reasons of life disrupt or go against this internal body clock. Circadian rhythm sleep disorder symptoms can be numerous but they all have in common the fact that whatever event or action is preventing the person from sleeping at the right time and being awake and full of energy during the day, which then has a direct consequence on the proper functioning of the body.
Circadian rhythm sleep disorder symptoms will manifest themselves if we continuously disrupt our internal body clock.
Sleep-related breathing disorders are a group of conditions characterized by disordered ventilation during sleep. Circadian (from the Latin for about a day) rhythms are present in almost all eukaryotic organisms from single-celled algae to humans. For optimal sleep, the desired sleep time should match the timing of the circadian rhythm of sleep and wake propensity.
There are six major types of circadian rhythm sleep disorder: advanced sleep phase, delayed sleep phase, irregular sleep-wake, free-running, jet lag and shift work.

Restless legs syndrome (RLS) is the most common type of sleep related movement disorders, which also include periodic limb movement disorder (PLMD), sleep related leg cramps, sleep related bruxisms and sleep related rhythmic movement disorder. RLS is a sensorimotor disorder characterized by a strong, nearly irresistible urge to move the legs. So for example someone staying up late at night watching TV is creating a disruption in the circadian rhythm of his or her body. The hypersomnia disorders are those in which EDS is the primary complaint and the cause is not disturbed nocturnal sleep or misaligned circadian rhythms. In circadian rhythm sleep disorders (CRSD), there is a persistent or recurrent misalignment between the patient’s sleep pattern and the pattern that is desired or regarded as the societal norm. While CSA is characterized by an absence of ventilatory effort, OSA describes a disorder of repeated mechanical obstruction of the airway. From an evolutionary point of view, circadian rhythms are crucial in allowing animals to anticipate and synchronize brain and body functions so they occur at optimal times with the external world. Psychiatric illnesses are more highly associated with insomnia than any other medical disorder, and epidemiologic studies of the general population show that one third to half of the patients with insomnia meet the criteria for primary psychiatric disorders, especially mood and anxiety disorders.

Many physiologic variables demonstrate endogenous circadian rhythms, including heart rate, blood pressure, blood glucose levels, hormone secretion, brain metabolism, psychomotor performance and, of course, sleep propensity. Parasomnias often occur in conjunction with other sleep disorders and it is not uncommon for several parasomnias to occur in a single patient. While the exact pathophysiology of CRSD is unknown, there is almost certainly an abnormal interaction between the endogenous circadian rhythm and the sleep homeostatic process that regulates sleep and wakefulness. RLS tends to become more pronounced during times of prolong inactivity and it has a circadian tendency for symptoms to be maximal in the evening, increasing in intensity toward the early sleep period.

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