@baa
Have you ever talked to your pulmonologist about whether or not a BiPAP would work better for you than the CPAP? I've never had sleep apnea problems but my cousin did. He had a CPAP but was switched to a BiPAP which helped him significantly although a lot of people can't use them for various reasons.
As far as the seizures are concerned, like the apnea, it depends on the individual and their circumstances.
I have had many Tonic-Tonic seizures in my recliner and haven't fallen out of it yet, at least to my knowledge. Although I think you would be safer in your bed. Can you prop yourself up in bed? To lessen the risk of falling out of a chair I wonder if a gait belt like the ones Physical Therapists use would help. It may not be long enough but two could be put together. I have seen very soft material in fabric stores. Maybe something like sheepskin for example and then make a belt/restraint out of it.
I sleep in my recliner every night.
take care of yourself,
Jake