I barely remember a movie about a man (or maybe woman) who had 2 lives: when he goes to sleep he wakes up in his dream, and when he falls asleep in his dream he wakes up in his real life. But he couldn't tell which life is his dream and which one is reality. As I recall, he was a scientist and he started taking notes and sending letters and messages to himself.

I know it is not much but does it sound familiar to anyone?

Edit: I remember now that I saw this on tv around 10 years ago. Perhaps the movie was from Poland or Checkslovakia or other central/eastern european country.

Edit2: A friend of mine told me that he also saw this movie. As he remembers it was a sequel of Accumulator 1 and it was called "akumulátor dvá", but can't find it on the internet.

  • I guess there are a bunch of stories like that. Could it be the same story as in this question? That one was identified as "Dreamer's Worlds" by Edmond Hamilton, which you can read at Wikisource.
    – user14111
    Apr 20, 2016 at 2:21
  • If it really is the same story (not very likely) then, unless you're old enough to remember stories from the November 1941 Weird Tales, you must have read it the 1974 Edmond Hamilton collection What's It Like Out There? and Other Stories.
    – user14111
    Apr 20, 2016 at 2:35
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    There was a 2012 tv show; Awake. The premise was about this cop, who after waking up from an accident induced coma, found himself in one reality,where his wife had died in the accident, would go to sleep and be awake in another where his son had died. He couldn't tell which was the real one. He used information gained from one reality to help himself in the other
    – KenM
    Apr 20, 2016 at 4:00
  • @user14111 I don't remember the medieval part, so I guess it is not that story. But it sounds interesting, thanks, I'll have a look.
    – psmith
    Apr 20, 2016 at 7:48
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    Excerpt from czech movie database: Name "Accumulator 1" was intended to confuse viewers that sequel(s) exists.
    – doomista
    Sep 14, 2017 at 8:45