What Are The Episodes Of Temporary Paralysis And Non-responsiveness?

my daughter in law is suffering from a condition that the doctors can't figure out. She suddenly goes into a temporary paralysis where she can't move or sometimes talk..lasts about an hour and when she can move again, she is totally drained and confused..what is wrong with her? We are at our wits end, she has 2 babies inder 2 years old and is afraid to be alone