This is the answer. I started writing something then realised I’d just rewritten what you had written in different words. Autistic people tend to be less able to recognise what their body is telling them. I recently said to my partner that I have been exhausted and really tired and she responded that I’d had a busy week, done 9 hours of driving in heavy traffic and terrible weather and had poor sleep. I thought there was something really wrong with me, she pointed out perfectly valid reasons for me feeling the way I was.

It’s called “interoception” for anyone that wants a new special interest (or to add to theirs): https://www.autism.org.uk/advice-and-guidance/professional-practice/interoception-wellbeing