Faking Seizures

My mother-in-law has seizures every few months were she lays in bed shaking her head arms and legs. then she passes out right after and is still for a few seconds and Then she gasps for air with wide eyes like she woke from a nightmare.over and over all night. She responds to conversations in between her seizures. The next day she says her head and neck are sore and she tells stories about what people were doing and saying during her seizures. She always talks about her condition. She has never injured herself and it always conveniently happens in bed. She claims she has done it for years. I find it fishy.