Okay so I have this app called Lucid Dreams and you set a timer and after every X minutes or hours , it'll play this bell sound & I've been using it for awhile now and when I hear it I know to do a reality check , I've gotten a few DILD's from it , but I was wondering if I set it while I'm sleeping and I put in headphones or something , will I be able to notice it while I'm sleeping a do a reality check? Have any of you guys done something like that, and do you think it's possible?