- published: 07 Oct 2010
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Dreams are successions of images, ideas, emotions, and sensations that occur involuntarily in the mind during certain stages of sleep. The content and purpose of dreams are not definitively understood, though they have been a topic of scientific speculation, as well as a subject of philosophical and religious interest, throughout recorded history. The scientific study of dreams is called oneirology.
Dreams mainly occur in the rapid-eye movement (REM) stage of sleep—when brain activity is high and resembles that of being awake. REM sleep is revealed by continuous movements of the eyes during sleep. At times, dreams may occur during other stages of sleep. However, these dreams tend to be much less vivid or memorable.
Dreams can last for a few seconds, or as long as twenty minutes. People are more likely to remember the dream if they are awakened during the REM phase. The average person has about 3 to 5 dreams per night, but some may have up to 7 dreams in one night. The dreams tend to last longer as the night progresses. During a full 8-hour night sleep, two hours of it is spent dreaming.
Blind may refer to:
Blind may also refer to:
The soul – in many traditional spiritual, philosophical, and psychological traditions – is the incorporeal and immortal essence of a person, living thing, or object. Some religions teach that all biological organisms have souls, and others further still that even non-biological entities (such as rivers and mountains) possess souls. This latter belief is called animism.Anima mundi and the Dharmic Ātman are concepts of a "world soul." Some religious thinkers, such as Thomas Aquinas, attribute souls to all organisms but teach that only human souls are immortal.
Soul can function as a synonym for spirit, mind or self; scientific works, in particular, often consider 'soul' as a synonym for 'mind'[citation needed].
The Modern English word soul derived from Old English sáwol, sáwel, first attested to in the 8th century poem Beowulf v. 2820 and in the Vespasian Psalter 77.50, and is cognate with other Germanic and Baltic terms for the same idea, including Gothic saiwala, Old High German sêula, sêla, Old Saxon sêola, Old Low Franconian sêla, sîla, Old Norse sála as well as Lithuanian siela. Further etymology of the Germanic word is uncertain. A more recent suggestion connects it with a root for "binding", Germanic *sailian (OE sēlian, OHG seilen), related to the notion of being "bound" in death, and the practice of ritually binding or restraining the corpse of the deceased in the grave to prevent his or her return as a ghost.