sleep's sleepiest soldier

i think that works well personally! the lyrical themes of give/take and longing and Wanting from both sides make sense with it. even the "i want to want to live, and so do you" in Fall For Me. Sleep is driven by wanting, and being made from wanting itself, when it gets what it wants it just continues to go further, to the next step of its desires, ever insatiable. it becomes entwined with Vessel because when they meet for the first time, they want the same thing. they're both dying, and still they want to want to live. to be more precise, Sleep wants fuel; its existence relies largely on humans, and it needs someone who feels strongly and passionately (please don’t ask me why it’s dying, i don’t even know and don’t want to look too much into it). Vessel, on the other hand, wants a way to turn around his life that he may or may not have driven into the ground, and he believes that it cannot be fixed by any existing means, which is why he's lost all hope in living anymore. but those two desires perfectly coincide, do they not? they can help each other get what they want. so they try. 

it doesn't work out. it backfires horribly, in fact. i've talked about it before, but i think it's very important to mention regardless. Sleep, being pretty much desire incarnate, may have harbored certain negative feelings of its own towards humanity, but they never would've become anything if it were not for Vessel. Vessel's anger at the world around him, the way he believes he has been wronged by everyone, is palpable, and with Sleep having to draw on Vessel's emotions to survive for the time being, that anger infects it, too. the passive unnamed negativity becomes a strong desire to take revenge. with all of it combined, Sleep's supernatural power and Vessel's uncontrollable rage slowly takes over both of them, and Him is born, a despicable thing. it's all-consuming blind rage taking on a mind of its own, much like how Sleep came to be but so much more unstable and volatile. the revenge on humanity doesn't go further than a single person torn to bits with bare hands and teeth, both too dull to be effective, but that thing is nothing it not fucking determined. it does fall apart immediately after, though, because it was barely together as is and killing someone was the tipping point for Vessel's consciousness somewhere deep in there. plus Vessel’s body honestly couldn't sustain Him for much longer. sorry for the tangent, i really love talking about that fucked up abomination.

but yeah, this experience changes both of them forever. Sleep gets a taste of feeling human emotions to a full extent, arguably even more so because of just how much Vessel feels; Vessel gets a taste of wielding inhuman power and releasing his emotions through it. Sleep's usual straightforward path of progression (just gaining more power, more control over more things) diverges as it realizes that it needs to feel like humans do again. Vessel, on the other hand, is fucking terrified of Him or something similar coming back, so he closes himself off and tries to repress his feelings back down again. he won’t let Sleep in again no matter how much he wants to be able to express his emotion with the same intensity as he feels them again. Sleep is well aware that Vessel wants that sort of relationship back, too. Sundowning is essentially Sleep trying to win Vessel back over and convince him to “help each other” once again, and realizing by Blood Sport that if Vessel doesn’t think he can handle it this time, he just needs to be made better suited for it. unfortunately, Sleep finds that breaking Vessel’s spirit, making him entirely emotionally dependent on it, and practically isolating him from the only people he interacts with on the daily (his bandmates) by stripping away his humanity in their eyes is very much a working strategy for getting him where it wants him to be.

Sleep’s tactics of manipulation are… algorithmic? for the lack of a better word, in the way that it doesn't really have a reason why exactly it's doing things other than that they're what's worked on Vessel so far. no real understanding of human psychology and whatnot, only trial and error until it pushes the correct set of buttons in the right order at the right time. it does learn more and more as their relationship progresses. Sleep also doesn’t exactly lie; it’s shapeless by nature & only able to embody what others put into it, and even then to a certain extent. it only really talks & shows itself to Vessel at any point because of their connection, and it’s able to draw from all of his emotions instead of just desire like any other human for that same reason. no matter what form Sleep takes, it’s always akin to a shadow, although the exact way the shadows look depends on who Sleep is showing itself to - drawing (pun intended) from Vessel’s artistic heart, Sleep looks to him like pencil on paper. Sleep does distort reality much in the same way that any emotion might - it pushes things to their extremes, makes them seem larger than life to get a response. as it grows and becomes more powerful in itself, it stops being able to appear as something smaller than it is, so pretty much any form it takes is an exaggeration of what it’s imitating. this ties directly into the mimics (see this (tmbte) and this (sundowning) for context), but also just. anything that Sleep appears as to Vessel. during TPWBYT, Vessel feels like his emotional repression is suffocating him, and Sleep’s most commonly assumed form during that time is a literal ocean that Vessel is often trapped in, drowning. during TMBTE, Vessel feels like he cannot escape his situation no matter how miserable it makes him feel, and Sleep appears to him as a reaper, taking that thought to its extreme conclusion that Vessel's only salvation might as well be death. even though Sleep isn’t a dream deity, its appearances still function on dream logic somewhat; it invokes the feeling of something in one’s subconscious that what they’re seeing is the actual thing Sleep is imitating, even if the actual visual resemblance is minor (that makes sense right please tell me it does).