6 years old son with Cerebral palsy doesn't sleep trough the night. Help!

Hello. I have triplets who will be 6 in October. There are two boys and a girl. I IVF and my pregnancy was mostly on bedrest. Until 32 weeks, all was well. Than on one occasion, my blood pressure got elevated, but following lab results were normal. They were delivered at almost 34 weeks due to my blood pressure getting 180/100, so they were born the very same day via cesarian section. Out of 3, only one last born was intubated, but its my first born who developed CP. He cruises on tiptoes, when on the floor, he 'bunny hops', or scoots on his back. He had open heart surgery at 7 month of age due to patent ductus arteriosus and was in heart failure. He has a vertical scar on his chest, along sternum. Later on I found out that he got profoundly deaf ( I think because of administered vancomycin ). The only hope for him to hear again, I was told were cochlear implants. He is now past two surgeries 6 months apart.
He had a severe reflux and food would fountain out hour or two later. Now he is on Zantac, very low dose of erythromycin for motility, milk of magnesium for constipation.
He will eat soft baby food, will chew on soft cookies, cereal. Doesn't like much water, I have to give it by syringe. He still drinks Nutren Jr, which contains 50% whey protein for gastric emptying.
He is very sensitive to heat or cold. He gets ill very often and it lasts a week or more.
His sleeping is the greatest challenge. First 3 years of his life, he was up 2-5 am crying with colicky pain. Now he wakes up 1 am, very hyper and wants to play. He doesn't want to be alone, so he will come and wake me up. I tried feeding him, rocking him to sleep in a hammock. Giving melatonin puts him to sleep , but it doesn't keep him asleep.
Some additional info
He has a spastic quadriplegia
His hands and toes are always red, get cold really fast and turn blue.
His breathing overall ok, but sometime he has strider (noisy breathing ). I use Epsom salt for bath and give him long baths.
At this time I'm on my wits end. He can't talk, so I can't know why he is up, being very tired doesn't really work.
Please help me if you can
Any advice would be appreciated.
Thank you