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, although they have been a topic of scientific, 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
from few seconds to 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.
Dreams related to waking-life experiences are associated with REM theta
activity, which suggests that emotional memory processing takes place in REM
sleep.
SO, WHY WE FORGET OUR DREAMS?
Our forgetfulness is generally
attributed to neurochemical conditions in the brain that occur during rapid-eye
movement (REM) sleep, a phase of sleep characterized by rapid eye movements and
dreaming. But that may not be the whole story.
According to the study published
in 2002 in the American Journal of Psychiatry supports the theory that the
presence of norepinephrine enhances memory in humans, although its role in
learning and recall remains controversial. Also the study suggest that we
forget things because of the absence of the hormone norepinephrine in the
cerebral cortex, a brain region that plays a key role in memory, thought,
language and consciousness.
The problem of lacking
norepinephrine does not completely explain why we forget dreams so easily. The
dreaming end involves some of the most creative and “far out” material. This type of less
consciously directed thinking, however, is not easy to remember.
Recent research suggests that
dreaming lies on a continuum with other forms of mental functioning, which are
all characterized by activitby in the cerebral cortex. On the one side of this
continuum is concentrated, focused thought dreaming and mind wandering lie on
the other, with some overlap among the types.
There are several established
theories that help to explain the evanescence of dreams. Two theories actually
describe dream forgetfulness as desirable from an evolutionary standpoint;
The first theory explains this desirability in terms of learning and survival, and stated that "For early cave man, dreams of escaping lions by leaping from a cliff would not play out well when chased by a real lion not a good learning experience if dreams had the same memory imprint as real life".
The first theory explains this desirability in terms of learning and survival, and stated that "For early cave man, dreams of escaping lions by leaping from a cliff would not play out well when chased by a real lion not a good learning experience if dreams had the same memory imprint as real life".
The second evolutionary theory of
dream of forgetfulness was developed by Francis Crick, co-discoverer of DNA.
Crick maintained that "since the function of dreams is to weed out
unneeded memory connections that accumulate over time in the brain, dream
recall defeats this primary evolutionary goal of dreaming. Remembering dreams
can leave the brain cluttered with useless information. Dreams are, in essence,
an 'unlearning' process of junk memories."
One of the biggest challenges to
dream recall is our usual method of waking recall of past events. We are
accustomed to remembering the past chronologically, linearly, and in terms of
cause and effect. Dreams, however, are not always neatly arranged in time and
effect they meander, they drift through memory associations and emotional
connections.
Another challenge of dreams
remembering is its concerns and stressors. For many of us, the first thing we
think of upon awakening is, "What do I need to worry about? What do I need
to do today?" and the dream recedes like a wisp of the will.
The lastly challenge in dream
remembering is body movement and orientation, since the dream itself unfolds
with the dreamer normally at rest and horizontal. Upon waking, too much
movement can disrupt the mind's memory orientation of the dream scene.
CONCLUSION
In general, we are very good at
forgetting nonessentials. In fact, many of our thoughts, not just those we have
while dreaming, are lost. We tend to recall only things that we think about
often or that have emotional significance like a problem, a date, a meeting or
any other event. Mulling over important thoughts activates our dorsolateral
prefrontal cortex (DLPFC), a brain region that facilitates memory.
Although most dreams vanish,
certain ones tend to remain. These dreams were so beautiful or bizarre, they
captured our attention and increased activity in our DLPFC. Thus, the more
impressive your dream or thought, the more likely you are to remember it.
NB:
That's all about "Why we
forget our dreams?" as most people forget more than 90% of their dreams. If you've any opinions about this article you are free to post your thought on the
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Posted by: Lusubilo A. Mwaijengo
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