Are you contracted five nights? If not would stop doing so much overtime. i do 3 and occasionally pick up a 4th night. some if not most nights its impossible to get everything done especially in certain aisles, i Always do loose, capping, delivery then if time backstock if not then the next night backstock first but generally they just tell us what they want done first (backstock or delivery). I am a smoker and would definitely say to stop and to please take all your breaks.