Ok, so increased pain at bedtime is typical. In the day, kids are distracted and busy. Once they settle down, suddenly their brain isn't distracted by a million different things and they become more aware of the pain
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That is where the psychologist comes in. Some kids finding breathing exercises help them relax and fall asleep. Some do well with guided imagery. My daughter had (and still has) issues with sleep, so at first she used an app called iSleepEasy that was recommended to us by Boston Children's. It has guided imagery he can listen to and try and also things like nature sounds. M used both.
After a while, she got sick of that, so she started listening to audiobooks at night. She chooses books she has already read, so she doesn't stay up waiting to hear what happens. She ALWAYS listens to an audiobook now and it helps her fall asleep.
Her favorites are the Harry Potter series and the Eragon series. She must have listened to Harry Potter a billion times but still says it relaxes her and helps keep her distracted.
Pred could certainly be waking him up at night, even if he takes it at breakfast. It could also be causing the trouble falling sleep (well, in addition to the pain of course).
I agree that it is premature to think about a pain rehab program, since he has active inflammation and we KNOW that causes pain. It's only if once his Crohn's is controlled and he is still in so much pain, that you need to think about a pain program.
BUT, that said, a pediatric pain management doctor could give you suggestions though, to help with the pain right now.
Drugs like Elavil are used for pain. So are Lyrica and Gabapentin. You could also try a TENS unit. We got one from our pain management doctor so insurance pays for it and its supplies. But you can buy them online fairly cheaply.
Another option might be to have your GP talk to a pediatric pain specialist and have him/her give you some tips. Didn't your GP do that for H with a neuorologist? They wouldn't do that here but I don't really know the Canadian system well.
There are other apps too - I will check with my daughter about which ones work well for her. She was given a whole list from her psychologist and there are some on there which were more appropriate for a younger child vs. an older teenager/young adult.
Good luck!!