I've been messing around with this last night and this morning. I tried one of the sleeping ones before bed, I woke up 6 hours later very refreshed feeling. I'm usually pretty damn tired in the morning. I also tried one of the out of body experience entrainments. After about 20 minutes of listening my body began to send waves through me, then it felt like someone was pushing my matress. I even sort of felt invisible. Soon after it felt as if someone was standing above me and my heart began to beat very fast and I got spooked and turned it off. Not sure how much is a placebo effect, but there are a lot of reports saying these things work very good.