Hair in movies

Lately I've been thinking about how people in movies and TV series don't have very sensible hair for the situations they are in. (Sensible here means "styled in a way that is easy and fast to do, keeps hair out of one's way and does not make it too damaged or tangled".) I mean, what is sensible depends on the situation and personal taste: some like it long and some like it short and some like it loose and some like it braided, but I can't come up with a definition of "sensible" that includes a hairstyle that requires daily use of curling irons and hairspray for a person who does not in fact have daily access to either.

Anyway - movies show a lot of other things that do not exist, what with artistic license and the audience wanting to see people who look good. What I really wonder about is the documentaries from the time of WWII. Almost all women of that period, regardless on nationality, hair type and hair length, seem to have hairstyles that require daily use of some curling device. How did they manage it in the middle of war?

The three possibilities that come to mind are a) I am wrong and 1940s hairstyles did not in fact require daily curling, b) they did in fact have enough time and curlers for it, c) fashion was so important that they did it even when they did not have enough time.