having been diagnosed with sleep apnoea myself , i found that i was falling asleep for no apparent reason both at home but also more worrying at work. It seems to be a problem with shift workers who have fat necks ( size 18 or above collar ). This is not always the case, however, erratic sleep pattern caused by air not getting through prevents normal oxygen levels which mean that you do not sleep deep or long enough . I would suggest that a visit to your doctor and a referral to a sleep clinic. You may have to give up driving until it is sorted, good luck. Mr Cupid.