Treat the cause, not the symptoms. Adrenal stress hormones such as cortisol are released as a product of extremely low blood sugar, and can lead to muscle catabolism.
A possible course of action would be drinking a slow release carb formula during the workout to keep blood glucose levels from getting so low.
NOTE: High GI carbs which are consumed post workout go directly for glycogen synthesis. However in a normal situation, they could trigger an insulin spike which could then cause a drop (depending on factors such as insulin sensitivity, and activity level) causing cortisol release. So IMO, stick to dextrose/maltodextrin for a PWO shake, not a during workout drink.
Also, I can definately certify that you need more sleep nick :P |