Thats happened to me twice. I try to play one on the morning upon waking. I'm truly not a morning person, and on two seperate occasions I've drifted into a five minute sleep to be awoken by pauls voice, not sure if id would wake a deep sleep though? I thought about setting a tape deck to endless repeate, and trying to sleep with the earphones out to get 6-8 hour exposure, at 20 minutes per tape (est) thats 3 per hour