Noah woke up at 4am again complaining of insomnia and nausea.

Noah woke up at 4am again complaining of insomnia and nausea. He had cold sweats again, his mouth was dry and his poor little heart was thumping so hard in his chest.
I gave him a zofran and water which made him feel better but he was up until 6am tossing and turning trying to fall back to sleep!
He woke up this morning feeling good but just said he had a rough night!
Not sure why he is having insomnia and cold sweats this cycle. Usually he has it during steroid week but having it throughout this new cycle is new for him. I have been trying to pinpoint something but he has done nothing different from any other cycle.