When I was in my early teens, I had a small weather station and recorded the conditions for a few years. And I have heard of so many Aspies who did exactly the same thing.
Nowadays, for the past 12 years or so, I have kept a spreadsheet where one tab is my exercise program (primarily waking but some cycling too (where I exercised, for how long, distance, etc)), another is hygiene (my weight, when I put on clean sheets, when I got a haircut, etc), another is general for miscellaneous happenings worth noting, another is called tickler to remind me to get my anti-depressant script refilled, to get my car inspected, when my autism support group meets that month, and so on. I have kept records of what I ate when and how well I slept each night but I discontinued that when I got all this data that I never referred back to.
Yes, I think record keeping is quite an indicator of AS.
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Neurodiverse (Aspie) score: 120 of 200
Neurotypical (non-autistic) score: 74 of 200
Very likely neurodiverse (Aspie)
AQ = 38 MBTI = ISTJ Gender = Non-binary