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| R | Rebound Insomnia is the term, which is used to apply to sleep difficulties, occurring after discontinuing use of a hypnotic medication.
REM Latency is the name of the period of time from sleep onset up to the first appearance REM.
REM Motor Atonia is called the phenomenon, when the large skeletal muscles become limb during REM sleep.
REM Period is the REM part of a NREM – REM cycle. In case if it occurs early in the night, it may be as short as a half – minute, however, in later cycles, REM Period may last even longer than one hour.
REM Sleep Behavior Disorder (RBD) is the kind of sleep disorder, which occurs in extremely rare cases. Therefore, people, suffering from this disorder, act out their dreams, often in some violent way, and have bodily movements. As a rule the human body gets paralyzed during the REM sleep. People often report an ongoing hallucinatory REM dream episode during their activity. It should be pointed out, that REM Sleep Behavior Disorder may be considered as a warning sign of Parkinson’s disease. Moreover, it is usually associated with some kind of neuropathology, such as vascular insult, tumors, and brain degenerative disorders.
Rapid Eye Movement (REM) Sleep is the period of a deep sleep, when rapid eye movements take place. This REM period of sleep is considered to be normal part of everyone’s sleep cycle. it reoccurs in a cyclical manner and can repeat up to several times during a normal period of sleep. Rapid Eye Movement Sleep is characterized by depressed muscle tone and by increased neuronal activity of the forebrain and midbrain. The majority of dreaming occurs during this very stage of sleep, which accounts for about 20% of sleep in adult people.
REM Sleep Rebound is the increase in REM sleep, which follows unnatural reduction. It is also an extension of time in and an increase in frequency as well as in density of REM sleep episodes.
Restless Legs Syndrome (RLS) is one of the sleep disorders, which is characterized by a creeping sensation in the legs, which occurs while a person is in a still position, lying in his or her bed. This kind of a sensation results in an irresistible necessity to move and / or to jerk the leg. The sensations have the following features:
Are relieved by the movement of the limb;
Become more sensitive in the evening and at night time;
Cause involuntary limbs jerking during the period of sleep, and sometimes even during the period, when the person is awake;
May cause difficulty either staying or falling asleep, which results into the feeling of daytime tiredness and / or fatigue;
Occur during periods of inactivity.
Rheostasis is the physiological tendency to remain constant.
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