Reply to Mr. Blonde (who appears still to be up at 4am, if I'm reading email annotations correctly [new user]):
Yes, most definitely there is for me a strong motive/force of self harm. I've been staying up (on computer) till 2, 3, 4, 5am for, not a night or two, but for many nights, almost regularly, for 2-3 years or more. It has a quality of giving me some relaxation/private time to myself - free of other stresses - but I am also most definitely abusing myself, literally wanting to hurt myself, and in effect try to kill myself/wipe myself out/do suicide by other means (than more normal violent or direct self destructive means: gun, knife, pills, car crash, etc.)
This sounds really sick, and it is, but as I get more tired through the night, I do it more. Actually, I get more and more awake. I could never have pulled all-nighters like this in college: I stayed up one night all night to study for a French exam and it almost killed me. But I do it all the time now - night after night - slipping into doing it again the next night when I've been just sick with exhaustion during the day following the previous night and dying for work to be over so I could go to bed...and then I don't...and it becomes 11pm, 12pm, 1am,3am, 4:30am and I'm beating myself up again. (Maybe this is almost what bulemia or other self-abusive cycles are like - but I can feel myself hating myself and wanting to hurt myself and torturing myself by keeping myself up when I'm just exhausted [really, like some military or spy inquistion would do, with a single lightbulb overhead and officers/people standing around and questioning, prodding, slapping, etc. some poor prisoner awake and not letting him sleep).
Some of this goes with computer addiction - which I think is fairly rampant these days, along with a general devaluing of sleep as a waste of time - but it picks up on and is driven by a self-destructive, self hateful, angry, low self esteem thing in me that I can "feel" is a kind of sick pleasure in hurting myself - like anger I have at other people (parents were alcoholics - polished, upper class alcoholics, but alcoholicsnevertheless and just plain rejecting and frequently nasty. And of course, yes I know that one just has to do better for oneself and not take it in, and be responsible for oneself, and other people care and can help, blah, blah, but this is just a perverse pleasure/drive to take it out on myself.
Apologies for this long, pretty sick note; but I went looking for articles/research on the idea of this thread (Sleep deprivation as self-harm), and finding something by this exact title really locked into what I was thinking.
I'm just writing to show you that there is, or can be, something to you idea of possible self-harm as a motive or factor in sleep deprivation.
What's further sick about this is I know how wonderful it feels when I really get some sleep (much rarer than the exausted state I keep myself in), and how the positive chemicals boost my mood.