alarms

My 7 year old daughter was diagnosed with Benign Rolandic Epilepsy about a month ago.  She has had two seizures episodes, both at night while asleep.  She becomes incontinent during these seizures so we know in the morning if she has had one but that does not help us in the middle of the night.  We have been told that it is dangerous if she seizes for longer than 5 minutes but it is difficult to know what is happening if we are asleep as well.  The nurse practitioner at the nuerologist's office suggested an incontinent alarm that goes under her sheets but I have not been able to find one.  The only one I could locate attaches to her underwear.  We are trying to keep things as normal as possible.  She isn't thrilled with that idea.  Has anyone ever seen this type of alarm or have any other ideas?