I'm posting here to cast as wide a net as possible in case anyone has experience of this. I've previously posted on the SN boards but can't find anyone who has experienced this.
DS (age 15) sometimes doesn't sleep at all for 36-40plus hours. So this week for example he woke at 6am on Thursday morning, never went to sleep that night and finally went to sleep at 7pm on Friday night.
He is severely autistic, has Down Syndrome, is physically disabled, vision impaired and hearing impaired. He has sleep apnoea.
He uses an antihistamine and melatonin to get to sleep each night and can't get to sleep without the antihistamine on any night (hence why he stays awake all the following day after a night of no sleep until he can take it that evening).
It currently happens on about 5th night so he's missed a lot of school already this year.
Does anyone know of anyone who has severe insomnia like this? I'm looking for any leads - if it's connected to a neurological issue, the sleep apnoea (and overtiredness), ASD, Down Syndrome, anything.
Any opinions/suggestions/ speculation much appreciated.