3 hours is approximately one standard REM sleep cycle. So you could be somewhat okay.
From your previous post you mentioned looking at screens while tired, which would suggest a problem with Blue Light.
Deep sleep uses the chemical Melatonin, which is naturally produced by one's body at night time. Blue Light, e.g. from screens and LED light bulbs, tricks the body into thinking it's still day time, so it doesn't produce its sleep chemical.
My suggestion would be to remove electronics from the room or shut it away/turn it off, and limit screen use for a few hours before bed.
(Not saying that this is definitely the solution, just a suggestion)
3 hours is approximately one standard REM sleep cycle.
I think it's 90 minutes
Blue Light, e.g. from screens and LED light bulbs, tricks the body into thinking it's still day time, so it doesn't produce its sleep chemical.
idk if it’s something all computers can do but turning on “night shift mode” blocks the blue light. for better sleep i think you’d probably want to stop using screens altogether in the last few hours before bed ideally but this can help too.
Could you be thinking of my previous post?
I had a blue themed dream last time
I was in an empty building with a lot of rooms and short and narrow halls that connect them
The walls were light blue, the floor was covered in a dark blue carpet, and doors were some shade in between, some doors were locked and the whole building was lit by a dim natural light as if it was dusk or dawn
I was floating there like a ghost so I explored the building
Some rooms had just a desk, some had a TV, and others had something that looked like a photocopier but was full of gears
After a while I wanted to get out of the building. I look at one of the open windows and I can see the outside. After I pass through the window I find I'm still in another hall, I pass through another window the same thing happens. Tried that a few more times but I couldn't get out.
Actually, it seemed like this previous post was neither you nor OP.
I wish I could remember such detailed dreams... I should take my own advice.
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