Sleep paralysis
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Sleep paralysis is a phenomenon that is distinctively separate from that of normal dreams. It can be defined as a state in which people, either when falling asleep or wakening, temporarily experience an inability to move which is often accompanied by hallucinations. More formally, it is a transition state between wakefulness and rest characterized by complete muscle atonia (muscle weakness). It can occur at sleep onset or upon awakening, and it is often associated with terrifying visions and external hallucinations (e.g., an intruder in the room or a demon sitting on one's chest), to which one is unable to react due to paralysis. It is believed a result of disrupted REM sleep, which is normally characterized by a complete loss of muscle control that prevents individuals from acting out their dreams.
Many people find sleep paralysis to be a horrific and negative experience but it can usually be escaped by simply changing the rhythm of one's breathing. When one changes their breathing pattern, such as holding one's breath or breathing much more deeply for roughly 15 seconds or more, the body will likely notice the change and exit sleep paralysis.