I watched a documentary that implied that pre-1941 Blitzkrieg was as successful as it was due to the fact that German soldiers did not sleep and were basically tweekers with guns and tanks. Is this true?
The question of German use of amphetamines in the Second World War has been popular since the publication of a recent – much exaggerated – book on the topic. There is always more to be said, of course, but you might like to review these earlier discussions of the same topic, both led by u/commiespaceinvader, while you are waiting for fresh responses to your query: