I tend to normally only wear a hat in very cold or very wet weather. Also when I am doing DIY repair work I wear a builder's hard hat much of the time. I have found that if I bump my head on a pipe, tree branch or other thing while wearing a hard hat it is much less horrible an experience than if I bump my head on the same object. I suspect that the hard hat mitigates the sensory issues of bumping your head on a pipe.
The hard hat came close to saving my life once, I was working on a project when suddenly a lump of wood fell out of the sky and hit me in the shoulder. I was wearing the hard hat, I was aware that if it had landed a few inchs away it could have got me in the head. So hard hats are good.
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Health is a state of physical, mental and social wellbeing and not merely the absence of disease or infirmity
I am not a jigsaw, I am a free man !
Diagnosed under the DSM5 rules with autism spectrum disorder, under DSM4 psychologist said would have been AS (299.80) but I suspect that I am somewhere between 299.80 and 299.00 (Autism) under DSM4.