Hey, welcome, I am younger then you here
Not sure how it affects dreams, but watching tv or a laptop uses up a lot of brain resources and makes you more tired then reading a book or watching photos or a movie on film. Plus, it excites your brain too much, when melatonin should be calming it down in order to sleep. Therefore, you shall rest less, your body recovers less, more toxins stay in your system, etc...
One fact that less people know is that colours on a laptop are in fact, a sum of 3 colours that mimic a real color. Plus, your eyes and brains are bombarded with that same colour blinking 50 times per second. I have studied this on Film School, not on faulty logic urban myths you find on dumb emails or facebook posts.
Technology has changed a lot of things, but the natural human biological clock, if changed, faces some stress. Check this image here, so you see what I mean: en.wikipedia.org/wiki/File:Biological_clock_human.svg (sorry you have to copy and paste, I am not allowed to post a link)
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Now, knowing the right thing to do, and doing it, are two totally different things... Although I do not believe on the lame excuse like "I am a night person". Which classifies as nonsense (imo) as believing to be a vampire or a werewolf. Some people are tall, some are short, some are hyperactive, some are lazy, some are extrovertive, some are introverted. Its like trees, and cats and dogs. But you dont find trees blossing in the snow while the rest of the same species has no leaves.
Its all a matter of habit, and thanks to a very, very recent invention called gas, and later on, the electricity. Or we would all be sleeping when its dark. If you want to learn more about how we only recently changed our habits, watch this amazing BBC series on youtube: "The History of the Home" and for this that I mentioned, the episode for "The Living Room"
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Cheers
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