There are reports in the thread above about how energizing this field can be. (Everyone is different and reacts differently to individual fields.) So, forum friends have suggested that this not be played before (or during) times when you want to sleep.
In my own experience, I have found this field to be energizing. Initially, it interfered with me falling asleep, but I was about to play it just fine once I was already asleep. YMMV.
In the Official Sapienmed FAQ (Updated) thread, Sammy makes a point that’s there’s no need to listen to a field (especially a physical field like this one can be) that’s longer than 10 minutes in length (this is 15:16) more than once. That’s from the Official thread and from the host of this forum.
Of course, there are many people who listen to this more than once without issues. I like to listen to the guys dance of the guy on the inside.