i think it was the type of rc. in my opinion that rc isnt reliable. i would suggest the nose pinch rc. just hold your nose and see if you can still breath through it . if you can then u are dreaming. i thiink this rc works so well becuase ( correct me if im wrong) you cant hold ur breath while ur asleep or rather it would take a lot of concious effort to. and it would probably disrupt ur breathing pattern and wake you up.