IMO, the sleep and cortisol bits of the PB, which are also touted in other corners of the weight loss world, simply have little effect on weight loss! you can be running on a sleep deficit and stressed out as all hell, and still lose weight. i'm not saying it's optimal, don't get me wrong. but i read a lot of people focusing on either blacking out their rooms, or eliminating all stress (i don't even know how you do that), or bathing in cold water, or staring into the sun, or 'earthing', in misguided attempts to lose bodyfat. focus on food!!!!