Neurophysiological control of sleep with special emphasis on melatonin
Abstract
Sleep and wakefulness are two main types of human and animal behavior. On the average human beings spend about one-third of their lives asleep. The sleep-wake cycle is the most important circadian rhythms which alternates in a periodic manner lasting for about 24 hours. Sleep is determined as the natural periodic suspension of consciousness characterized by relative immobility and reduced responsiveness to external stimuli. The researchers have found and identified many special brain structures and systems controlling waking, rapid eye movement (REM) sleep and non-rapid eye (NREM) sleep and the transitions among these states. Currently, there is an enhanced interest of researchers toward sleep and its neurophysiological mechanisms of regulation because the number of people suffering from various sleep disturbance such as insomnia, delayed sleep onset, duration and propensity of sleep, worldwide dramatically increases. In addition to the next day drowsiness, nervousness, tiredness and decreased workability, it has been suggested that sleep is important also for the maintaining of mood, memory and cognitive function of the brain and is essential for the normal functioning of the endocrine and immune systems. More recently, new studies show a sustained link between sleep disorders and different serious health problems, including obesity, insulin resistance, type 2 diabetes mellitus, cardio-vascular diseases and depression. Therefore, the purpose of this review is to summarize…
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