Today is his birthday - Trigger Point 1 - a ‘non-routine’ day where things out of the ‘ordinary’ occur. This can induce unrecognised feelings of anxiety (attention on him / unfamiliar routine / not ‘knowing’ exactly what is going to happen) for days beforehand (as well as excitement) so already his ‘bucket’ has got something in.
Next time - create a plan with DS that clearly outlines the day a week or so beforehand (what the routine will be, what and when opening presents looks like, does he want all surprises, a small surprise or no surprises? Etc)
he woke up at 4am - Trigger Point 2 - excess tiredness as you go on to say is a known issue.
Next time - make sure the plan addresses what to do if he wakes up super early. How can you reduce the likelihood of excess tiredness? Can he had a quiet gift waiting on his bed to open and use? Can he go back to sleep? Can he go to bed earlier the night before? Can he have a nap/quiet time at some point in the day?
We got him a new bmx, some pens, a book some sweets and a ps5 game. - Trigger Point 3 (possibly) - I don’t know if he got his gifts all at once, with everyone watching him, getting themselves involved, everyone talking, everyone touching his gifts once he’d opened them so not sure, but for many autistic people having their stuff messed with / touched by others especially when new can be a big trigger point. For example, I cannot let anyone read a magazine or book I’ve bought until I’ve read it first. It’s not about being selfish and not wanting to share. You can have the bloody thing once I’m done with it. It’s about keeping things ‘right’ and doing it the ‘right way’ in my head. It’s really hard to explain, but once you have a ‘rule’ generated / developed in your head and you’re used to it, it’s very difficult when someone messes with it.
Next time - make sure the plan addresses these points. If he is someone who would prefer to have his gifts in a neat pile with no one else touching them to start with then make sure that happens. If you know the younger ones might want to be a bit nosy make a plan about how that can be addressed / managed.
he immediately got annoyed about younger siblings asking for a sweet - screamed at them both called them idiots etc. - Trigger Point 4 - kind of same as above, though any personal insults thrown should be an immediate stop and reset. If that means taking a break from the situation to prevent escalation then do it. Does he have a quiet area where he can self-soothe or use some sort of sensory input? My place is the shower (water).
he then said he was going out on his bike - I said it was tooo early, too wet & the tires needed pumping. - Trigger Point 5 - he has something shiny and new he wants to try out that you gave him. You gave it to him early in the morning, when it was wet outside. To my autistic brain (and possibly his) that means logically it’s fine to use because otherwise you wouldn’t have given it to him would you? To then be told, well, actually, No you can’t use it, even though I gave it to you now, because it’s too early, too wet and it’s not even ready to use yet makes no sense to a young black and white thinking autistic brain. Not properly understanding why leads to frustration leads to the contents of that bucket reaching the top.
Next time - if he’s getting an outside gift plan for it. Pump the tyres up beforehand, get it ready to use before you give it to him. Plan with him how it will be used. If it’s wet, coats on, a few go’s round the block then back in or something. etc etc.
The falling off / accident tipped his frustration over the edge and then you had the full meltdown.
So there were possibly 5 trigger points filling the bucket up to the brim then it overflowed with the last thing and meltdown happened. You can’t stop a meltdown once it’s in full flow so no amount of shouting, cajoling, explaining etc is going to do anything. But have a plan for where he can go during a meltdown. What can he do to get his frustrations out that is safe and isn’t directed at anyone? Throwing a bouncy ball at the wall in his room? Ripping up paper? Punching a pillow? Getting in the shower?
Once he is calm, address the name calling / nasty behaviour before the meltdown. Together you need to learn to recognise what fills his bucket the most and what helps to empty it.
Oh, one last thing…..bright lights are an issue for me. So maybe try and use lamps rather than bright overhead lights sometimes?