I honestly do not see how being tired can be unsafe at the range. If being a little tired is going to make you shoot yourself or some other craziness you probably should consider going through some serious weapons safety training. I can honestly say I have never questioned my weapons safety no matter how tired I was or what I was firing. If you do not feel safe shooting when you are tired you really shouldn't be carrying if you are tired. If you cant safely shoot you can not safely carry.