Sleeping challenges.

Hi everyone 

I have just joined the site/forum. 

my partner and I care for our four year old autistic grandson, who was diagnosed with autism two years ago. We are trying to get him to settle down at night for sleep, his routine is dinner, bath, bed with his tablet for 30min then we take it off him to go to sleep, he then takes anything from 30 min to 2 hrs to settle before he goes to sleep. He will then fidget in the night, completely cover himself with his covers, wake up crying but then go straight back off. We can’t take his tablet away from him as he knows this is his routine and he will have a meltdown. Any advice that has worked for others is welcomed that we can try please.