I went for my first sleep study last night.  Tech said I did not snore one time.  I did however have brain occurences.  Didn't seem to think I had sleep apnea.  My husband says I usually snore every night and sounds like I quit breathing.  I recently had surgery and the doctor noticed my breathing was stopping and recommend I get study.  Is it unusual to have no symptoms at study?  Do they ever redo it? Thanks for help.