I'm curious to find out if those issues are also experienced by people who aren't autistic - perhaps to a lesser degree, or with different explanations than the ones that I mentioned. Do the issues I described sound like what you're experiencing? Are they close, or similar in some interesting way?

How will you distinguish between a non-autistic 'experiencing an autistic associated experience to a lesser degree' and, well, someone experiencing a lesser degree of autism? Considering the context I am not sure if a "I notice that too" from a LessWrong poster would inform me much at all about how much prevalence independent of the causal factors behind autistism.

My experience, for what it is worth:

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).

My main experience of 'tiredness' is metacognitive awareness of impaired cognitive function. For example, I'll notice that my verbal expression and spelling becomes impaired and the names of things elude me and then conclude that I am tired. I don't feel 'sleepy'. Note that now that I have discovered melatonin I actually can feel tired (if I take ~6 mg). This was quite a novelty! I also seemed to have developed somewhat more awareness of other 'tiredness' indicators such as yawning over recent years (late 20s).

The above applies to hunger as well, for most part.

The second case involves not being able to stop whatever activity you're engaged in and go to bed, even though you recognize (perhaps briefly, before being drawn back into what you're doing) that you are tired and it would be a good idea.

Spot on.