At a lost what to do for the best

[sneezeboard]

Ds is awaiting an autism diagnosis. His behaviour is manageable but bed times are another matter. He'll bang around shout for us, come bounding in baby siblings room while we're getting them to sleep preventing them from going down
As a punishment as he can't keep doing this to baby I removed all screens tv consoles etc for 1 day and he behaviour that day was fab! Bed time was amazing
Screen were returned today as a 'well done really proud of you' and then behaviour today and tonight same story
I told him they're being removed again and then he screams and cries
I don't know what to do for the best I can't keep removing
We have time limits on screens but they don't work
The only thing that worked was total removal
But he got new games for Christmas and it seems unfair.
What do I do for the best?

How old is dc?
My son is 6 and asd he responds best to a timetable. So he has screens for set times in day but only those times. Could you set a routine so he has some access but at a time you feel would be suitable?

What's his bedtime routine like? Again we find a set routine works. Upstairs at 7, bath, teeth, pj's. Books and in bed by 745. It sounds more complicated for you due to younger sibling. Can you change routine to work for both? Either he goes down before younger dc or he goes after and can watch a bit of tv or something to entertain himself. I find for asd kids sometimes the situation needs to change rather than expecting the child to.