You keep these memories stored in your long-term memory even if you don't access them. There are a number of theories about how dreams are a way of processing different stores of memory (kind of like straightening up the files in a file cabinet overnight so they will be ready for use the next day ) so in dreams things that would normally stay in your long-term memory can be moved to other parts of memory.
So in a dream something that would normally be stuck in your longterm memory can sometimes show up in your working memory - where you actually think about things.
By the way, these different memory stores have real locations in your brain. People with brain damage that affects their memories lose functioning in specific types of memory, and not others (depending on where their brains were damaged.)
In waking life, things are moved out of your long-term memory for you to think about them when something happens that brings up an association you remember. For example, if many years ago you knew someone who used to wear a certain perfume, then you smell that perfume on someone else, it can get you to thinking about the person you used to know.
It's possible that something can happen that can remind you of something that happened between you and someone in your past, and if they are aware of that also - say it is something in the news or something that happened to someone you both know - it will remind you of them and it will remind them of you. So you might dream about them or think about them, and they might dream about you or think about you at the same time. You might not realize consciously the connection between the event that triggered you thinking about them and you thinking about them, so it could appear that you have suddenly been thinking or dreaming about them for no reason.
Last edited by Marcia; 12-21-2011 at 12:16 PM.
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