I used to think this thing works, but lately it'd dkne nothing for me...right now I just opened my eyes and while typing this, I'm supposed to be in theta...theta my ass, I've just obsessively ruminated my whole life in these 20 minutes...
Even hospital-grade sleeping pills can be resisted if a mind is busy enough! I'd consider a pre-bed routine, possibly some journaling before bed.
Dejan Markovic