None of those things are any good to you if you require sleep. Sleep is always left out of the SHTF prepper's equation for survival. It is their greatest weakness and will get them killed and robbed despite all their careful planning. If you think you can be vigilant and ready at all times, well then you will end up dead in just a matter of days once exhaustion sets in and you knock out cold from lack of sleep. It will be the end of many a prepper who arrogantly thinks they planned it all perfectly.