I used to pinch myself whenever I felt sleepy. Unfortunately I had to apply more and more pressure and pain the longer I went without sleep.

It was especially hard when you were not in a command position but just taking orders. When it was your turn in a command position there was so much to think about and do that you did not feel tired.
When I began flying long distances say from South Carolina to Hawaii or to Japan or when we deployed to Southwest Asia for Desert Storm and thereafter we were issued very strong caffeine pills that kept us awake.