My brother used to have a severe problem with grinding his teeth in his sleep. It sounded like he was actually popping and cracking his teeth and when you tried to sleep on the same floor as him in the house, you could hear it and it would keep you awake. When it started to actually cause problems with his teeth, the dentist recommended that he put in a mouth guard everynight before going to bed. Just a simple mouth piece that athletes (football players, wrestlers, etc...) use. Pretty cheap and you can get them pretty much anywhere I believe. It helped his teeth and made the sound disappear.
There isn't a way. You can only ask your dentist for a mouthpiece to sleep in.Grinding your teeth