Sudden Unexpected Death in Epilepsy Syndrome. SUDEP is when an otherwise healthy person with epilepsy dies unexpectedly, not as a result of an injury or status seizure (seizures that don't stop, the kind Owen has). The chances of someone with epilepsy dying of SUDEP are about 1 in 1000. The numbers go up to 1 in 150 for the type of epilepsy Owen has though.
FAQs here it says that close supervision may not be desirable, but if it can save a life it might be worth giving up a little privacy or autonomy. if someone you know has a seizure please don't leave them alone for an hour or two afterward if at all possible.