Yes, since I have been using setting 3 for the last few nights I have noticed as well that it takes me about 3 sessions to reach the euphoric state. However, last night when I used it again for sleeping (without the mp3) I did not reach the euphoric state and wondered why, and if it was because of listening to it with the 7.83 Hz mp3 previously... To confess ,I was pretty much very heavy headed for the rest of the afternoon and evening. I will never play the mp3 and biotuner during the day anymore! This combo is strictly for the evening!