3 yr old sleep, help please.

[Titsalinabumsquash]

My DS3 is 3, very nearly 4 and although he goes to bed beautifully and goes straight to sleep, he wakes up 4-5 times a night and comes to ask DP of he can lay with him, this leads to DP sleeping on DS's floor and ends up getting a bad back and feeling generally crap from bad sleep, I too am feeling the interrupted sleep quite badly.
We've tried a star chart and whilst
It worked brilliantly for other things, it's made no difference to this.

This is a behaviour thing rather than a sleep thing.

Everyone wakes ever so slightly throughout the night. It's just what happens between sleep cycles. Most people just shuffle around in bed, change position and go back to sleep.

Your DS wakes his dad up at these mini wake ups. It's habit because he knows his dad will come and sleep on the floor, so that's nice for your son.

If your DH simple said he wasn't going to do this anymore, your so. Would be unhappy but would in time accept it.

He just needs zero tolerance. Every time he wakes take him back to bed, minimum interaction, leave and shut the door. Repeat, repeat, repeat every time.

Give it a week or so and he'll realise he's getting no positive attention by waking up, so will hopefully stop bothering and will start just turning over in bed and going back to sleep when he wakes.