ddoubleU
https://www.beyondallreason.info/
Watch this space, it's already decent and also OSS.
PS: One hill I will die on is games using Discord as forum/wiki like this one does. Try searching google for information about unit or something, nothing. I guess I will have to make unofficial wiki/forum one day.
Still beta and lacks players but I think that is exactly what you want
I love it, I really do but it makes you ask yourself weird existential questions about games and jobs.
The other thing that made me quit after few years was that the company behind it (CCP Games), with it's current management, really seems to be incompetent.
EDIT: Also automatic different quality on mobile/wifi (dunno if original app has that)
Then these shocks also started happening before sleep, before entering or inside this N1 state, basically I would "hard on" consciously notice I am drifting which kind of catapulted me back into full consciousness. Though, it wasn't hard to start slipping back into sleep unless nervous for next day stuff.
I am not a lucid dreamer, I think I experienced that once but it was very ...murky, like a typical dream afterwards. Same for sleep paralysis, happened few times but it's rare and as far as I remember, it wasn't fear inducing.
Also, needs to be noted that my "sleep organization" is pretty fucked up and I often end up sleeping less hours then I would normally need, for days, refilling the deficit thru weekends.
Visually it's mixed up with "blank images" in that sense that I know there is something happening but I can't grasp it. It's like watching very fast recording - you know something is there but either it's too fast to catch or you are too slow to grasp the meaning (if there even is any).
What's weird is that these background songs actually do make sense, well at least in my head (heh) and these are not copies or mixes of anything I can remember.
I am mainly a electronic music junkie: DnB, techno, drumstep but from time to time I, mainly dictated by my emotions, listen to instrumental rock, indie metal and alike (BMTH, I Prevail, Royal Blood). But in contrast, all the songs in my head are instrumental, often being "lyrics first" which is pretty much out of my typical range - I like to fill in the words, feelings - some meaning into the beats myself, that is why I listen to progressive electro stuff with not much lyrics if any.
I am guy with absolutely basic music theory and zero exposure to anything like music composition (okey I sometimes dream (like in wish) that I would learn piano or bass).
Got unrootable old (but still fully working) phone there, might try to play with it.
Something along these lines
On a more serious note, within the circle of my friends this falls into "prank link" category - rickrolling etc.