This is my experience as well, for the most part.
The only times I recall "going to bed" feeling like a good idea is when I've been so far into exhausted sleep deprivation that base instincts took over and I found myself doing so almost involuntarily.
Even in those cases, my conscious mind was usually confabulating wildly about how I wasn't actually going to sleep, just lying down for a half a moment, not sleeping at all... right up until I pretty much passed out.
It's rather vexing.
Would you guys mind terribly if I picked your brains?
The kind of experience you're describing is described fairly often in autistic communities. There's a few variations, generally falling into the categories of sensory processing or executive dysfunction issues. The former category would include not experiencing, or noticing that you're experiencing, 'tiredness', even when your body is acting tired in a way that others would notice (e.g. yawning, stretching, body language). The second case involves not being able to stop whatever activity you're engaged i...
Full essay: http://www.gwern.net/Melatonin