DiscussionWhat is biological rhythm?Biological rhythm is the periodic biological fluctuation in an organism that corresponds to, and is in response to, periodic environmental changes (The Editors of Encyclopædia Britannica, 2014). An example would be the relative position of the Earth to the Sun and Moon with the effects of changes such as the transition from day to night. There are daily rhythms to many of our physiological functions and activities... our sleep, body temperature, alertness, neurotransmitter levels, etc. (Chudler, 2014). Biological rhythms regulate the most important functions of an organism. There are three types of biological rhythm, infradian rhythm, ultradian rhythm and circadian rhythm. Types of Biological Rhythm Circadian Circadian is a Latin word that has the root “circa” meaning about and “diem” meaning a day or 24 hours, the definition is that changes happen approximately every 24 hours (Hedge, 2013). It could be physical, mental or other behavior. This type of rhythm has an endogenous meaning within, it proceeds from within or from within. Some examples of circadian in plants are how it maintains flowering's reaction to the seasons and photosynthesis, in mammals the circadian clock helps perform tasks such as sleeping, waking, feeding, and determining whether an animal is nocturnal or diurnal. Circadian rhythms are present even in the absence of environmental signals such as light, temperature or social signals (Victor, Biological Rhythms, 2014). Since the circadian is endogenous, this rhythm is inherited or genetic and is dominated by our biological clocks which are rested and regulated by cyclical environmental signals called Zeitgebers. Usually their cycles have intensity and frequency that change in different parts... middle of the paper... I feel drowsy but without cataplexy. The different forms of narcolepsy are stimulants prescribed by your doctor to keep you active during the day, antidepressants to help treat cataplexy, and finally lifestyle changes. Parasomnia This disorder involves adverse events during falling asleep or waking up, including strange movements, behaviors, emotions, or dreams. and have the person remember nothing of this event happening. Sleepwalking, night fears; sleep talking, sleep paralysis, and sleep eating occur in parasomnia disorder and are some of the basic symptoms (Retini, 2014). Some risk factors are genetic, for example if a person in your family is a sleep walker, you are also likely to be a sleep walker along with stress, PTSD, medications, or drug abuse (Retini, 2014). Treatment for this disorder would be to talk to a sleep disorder specialist for help.