A friends of mine has been diagnosed with SA. In tests it was found that she actually stopped breathing over 17 times an hour during the night, and she has NO recollection of it. Now thats scary. It can have very serious effects if not diagnosed and treated, such as high BP, heart disease etc. Also, because your body isn't getting the proper restful sleep required there is more danger of road accidents through lack of concentration or even falling to sleep at the wheel and operating heavy machinery is also dangerous. Sleep Apnoea is one of the conditions that should be reported to the DVLA, if the sufferer drives. If it is untreated the DVLA could revoke your licence.
Please tell your BF to get it checked out.
Good luck. x