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We all have four to six dreams per night. But why do some people seem to r emember their dreams while others don't?
People who report that they have good dream recollection are more likely, than others who don't, to have been woken up during a stage of sleep referred to as REM (rapid eye movement). This is the stage of sleep where dreams occur, and if you're woken up during it you may recall the dream you were having more readily.
Light sleepers who are woken up very easily by the slightest sound tend to report having many more dreams they can remember than heavy sleepers who can nod off during thunder and lightening and do not know they've been dreaming at all. Therefore one way to remember your dreams is to set an alarm to go off frequently during the night, as you'll have more chances of waking during REM sleep. However,doing this exercise regularly will be bad for your sleeping pattern, and may mess with your body clock.
Interestingly, some people have the ability to dream to order, to a degree. If they focus on thinking about remembering their dreams, get a dream journal ready to write in and place it by their bed at night and tell themselves they will write down their dreams upon waking, they're more likely to actually produce a memorable dream.
Studies have shown us that during dreams we often play out different scenarios (情节) and our brains work out how to deal with them, should they actually occur in waking life. Thus, if you dreamed you lost your car keys and needed to find another way of getting to your destination, this could just be your mind working out what you would do in the future if this happened to you. The reason why people don't always remember dreams is that it would interfere (干扰) with waking life. An overload of information which may not be necessary could confuse your daily thinking, and lead you to perform less well. However, storing information away in your mental filing system located in your subconscious (潜意识), in case you ever need it, is far more efficient.