Firegirl , Hello from your firefighter or ex firefighter friend I should say . Though once firefighting is in your blood you are forever one . I have the same type of problem you do with the drowsiness . With mine there seems to be no rhyme or reason just some days I can not get out of the fog . I will fall asleep while my wife is talking to me (that goes over real good) , or if at some place other than home I will have to find a corner and nod off . It does seem to effect me when my pain level is up (sometimes) or if I had gone a bit without my pain meds (sometimes). Sorry to hear you are having this problem but interested that it effects others the same . Take care !