सपनों का सही मतलब क्या हैं और क्यों आते हैं ? what are dreams and why do we dream [Hindi]
A dream is a succession of images, ideas, emotions, and sensations that usually occur involuntarily in the mind during certain stages of sleep. The content and purpose of dreams are not fully understood, though they have been a topic of scientific speculation, as well as a subject of philosophical and religious interest, throughout recorded history. Dream interpretation is the attempt at drawing meaning from dreams and searching for an underlying message. 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.The length of a dream can vary; they may last for a few seconds, or approximately 20–30 minutes. People are more likely to remember the dream if they are awakened during the REM phase. The average person has three to five dreams per night, and some may have up to seven; however, most dreams are immediately or quickly forgotten. Dreams tend to last longer as the night progresses. During a full eight-hour night sleep, most dreams occur in the typical two hours of REM.
Sleep paralysis is a phenomenon during which an individual is unable to move during falling asleep or awakening, but is aware of their surroundings. It is often accompanied by frightening hallucinations to which one is unable to react because of paralysis and perceived physical experiences, such as a strong current running through the upper body. Sleep paralysis poses no immediate risk to those who experience it, although it occasionally causes significant distress.Episodes last from several seconds to several minutes
A lucid dream is a dream during which the dreamer is aware of dreaming. During lucid dreaming, the dreamer may be able to exert some degree of control over the dream characters, narrative, and environment.
Precognition also called prescience, future vision, future sight is an alleged psychic ability to see events in the future.
Scientific investigation of extrasensory perception is complicated by the definition which implies that the phenomena go against established principles of science. Specifically, precognition would violate the principle that an effect cannot occur before its cause. There are established biases affecting human memory and judgment of probability that sometimes create convincing but false impressions of precognition.
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सपने क्या हैं ? इस प्रश्न का कोई ठोस प्रामाणिक उत्तर आज तक खोजा नहीं जा सका है| विज्ञान मानता है कि नींद का हमारे मस्तिष्क में होने वाले उन परिवर्तनों से संबंध होता है, जो सीखने और याददाश्त बढ़ाने के साथ-साथ हमारे शरीर की मांस पेशियों को भी आराम पहुंचाने में सहायक होते हैं।