 [ Symptoms ] when i sleep on my back as i fall asleep i stop breathing is this normal  after i stop breathing i jolt up turn on my side and can then fall asleep it concerns me that my lung muscles are not strong enough to breath while i am laying on my back but perhaps it is normal i am 5 8 190 lbs and exercise daily run lift weights sports and am 47 [ Disease ] false negatives are way more common than false positives false positives rarely happen did you take them at different times in the day if you are very early on a positive may only be detected if you use very concentrated urine such as first morning urine