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You dream every night, everyone does. You just don't remember the dreams on waking.
IDK about windows to the subconscious but if I have an interesting or recurring dream, sometimes I try to interpret it, and have gotten some things out of doing that.
Maybe there is some gadget that can detect when you are dreaming. You wouldn't want to have it wake you automatically on a regular basis (disrupting sleep isn't always avoidable, but it isn't good). But you could try it once or twice and see if you remember the dream then.
Dreaming is also called REM (rapid eye movement) sleep, because people's eyeballs jerk around during that sleep phase. Usually the jerking is pretty random. Once during a sleep study, a guy's REM suddenly changed to very rhythmic, repeated side to side movements. That was weird enough that the researcher woke him and asked him what he had been dreaming about. The answer: playing ping pong. The eye movements had tracked the ball going back and forth.
Not just everyone, every mamal dreams during every sleep!
I wonder what cats dream about...
I'm sure a sleep lab might have some equipment to track your eyes for REM.
When I nap my Fitbit shows "deep sleep" for my heart rate vs light sleep and a little rem
Mine tells me I'm asleep when I'm wide awake reading or watching movies. I wouldn't trust it too much.
Same...