>>371508964
I just take a can of food with me since I find so much lying around I rarely go hungry ,but just in case I take a small can. 
Energy drinks are good for restoring fatigue but they're heavy; leave stashes on them on maps. Generally you should never be sleeping past the early game.Just fatigue restore and spend the extra time awake to loot more. Kill during the day, loot during the night. No sleep, ever.