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Why can people remember only the last dream they have?

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Maybe it's related to the way we forget out dreams soon after waking even though it was so vivid during sleep. I've heard that our brain releases a chemical that gives you a sort of amnesia. If we remembered all our dreams we may get them confused with real memories. Possibly :)

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Good point
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I thought you only had one dream each time you sleep.

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You have up to 5 dreams
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i heard that you have hundreds of dreams but you only remember the last one! :)
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wow.
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Dreams are not fully understood by scientists.Most of it has to do with paying attention. Some also believe that dreams are about the brain "junking" memories or memories that serve no purpose.

http://psych.ucsc.edu/dreams/FAQ/index.html#recall

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Well I don't think that any of my memories include me growing eagle wings and flying over the ocean. So I don't think that dreams are junk memories.
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No... The mind purges memories of "trivial" or just basic "junk" memories. For example: walking to and from your kitchen every day isn't something you store permanently. So, your mind may "purge" it by adding it to a dream. (IE: You walk to your kitchen to find the ocean there)
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i heard that you have hundreds of dreams but only remember the last one! :)

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I can remember more than my last dream. I remember the really good ones.

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You are wrong. I do not even remember my last dream. When I wake up, I forget it.

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Some remember more than others...
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I am a Physician Assistant who also suffers from sleep dysfunction, so I know something about this. We only remember dreams when we are in a semi-wakeful state (e.g. daydreams) or in very light or interrupted sleep. That is why you may be remembering the last dream of your sleep, because you are in the process of waking up. However, you know when you are sleeping deeply (as you should) when you don't remember your dreams at all, or when you know you were dreaming but can't recall the dream.

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Some people will remember more than that. I can remember up to 3 or 4 dreams in one night sometimes. It depends on what you are thinking about when you wake up. If you immediately just start thinking about other things, than yeah you might only remember bits and pieces. If you wake up still thinking about what happened in your dream, than you are bound to remember at least something bigger.

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