I didn't feel it coming on, the first thing I remember is someone helping me. They thought I was dead. I was unconscious on the ground with eyes open, hit my head on the floor and bit through my tongue so I was bleeding from the mouth. When I woke up I had no idea where I was or what happened so I was very agitated. At least for the type of seizures I have, its like an on-off switch. There are other types though.