From about the age of 5 to 10, I had almost constant nightmares, had sleep paralysis a few times, and some seep walking episodes.
In my case, and in the few cases I remember, the environment was basically the same as my actual house, but also weird, sometimes colourless, and with ghostly and dreamlike elements in addition to what I would normally see.
Some of the nightmares and episodes were so vivid that I can recall them 40 years later.
One time I woke up in the kitchen after I turned on a tap and splashed my face with water in my dream as I sleep walked.
In another very strange episode, I fell asleep and went into a sleep-walk after I had already gotten up and was on my way down the stairs. The sense was that your conscious will is just not in control, and you’re just going with whatever the fuck your brain is deciding to do—which in this case was to walk into the living room, turn on the TV (the screen showed only static), then sat down and stared at the TV while strange ghostly whisps began to swirl around me. I snapped out of it when my mum opened the door and walked in.