Both runner and bounce have suggested ideas I was thinking of
My D's needs to be challenged as his asd makes him quite negative and it's surprising how the words we use can affect how we feel..
I.e "there's no point in me doing X as won't make me feel better"
"I can try doing x to see if it helps even a little bit"
You won't think it makes a difference but over time,definately
We use lots breathing techniques here(which I can share),and distractions like adult colouring books(D's loves the intricate ones by Kirby rosanes which you can buy cheaply at the works)
Sensory activities are surprisingly useful- resets like running hands under very cold tap,sniffing peppermint,rosemary or other essential oil that is quite strong/pungent(but pleasant) or chewing gum/sucking on a mint
Dd2 likes bouncing(mini trampoline indoors)or you can buy lavender scented play DOH
We also are big walkers which is excellent way to remove the cortisol build up from be stressed out.dd2 loves going out and walking barefoot in grass where possible/safe to do so<no dog mess or glass etc>
Sleep needs routines no matter how much there are complaints.mine are made to get up or I keep banging around ,hoovering,coming upstairs "to put things away"etc even in the holidays by 8,9 at latest as experience taught me if they get out of habit reining back in is verging on impossible for over a month.not good when September arrives and everyone's overtired,overstimulated and stressed!
Good bedtime habits include blue light glasses if can't win the stay off tech at leastcouple hours before bed(always off an hour before tho.reading,listening music,colouring,magic painting or diamond art are all popular here)initially lots more effort but the gains make it worthwhile and I do think easier implement during hold than during term time when school stresses make it very hard to get anywhere