I have been "watching" blade Runner 2049 now for almost a year. I always start it, and by halfway I am asleep or on to the next activity.
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When I restart it a week or month later, I realize that I don't remember half of the earlier scenes that I should have. Making me think that I fell asleep earlier than usual.
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One day I will finish it...
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Edit: It seems 2001: A Space Odyssey is a very popular choice.