Of course soldiers in the First World War did, though sleeping was probably very difficult.
They used shovels and picks to dig out the trenches.
In trenches
In the trenches.
Inside the trenches there is dugouts. They would sleep in there.
chips chips
dugout?
In trenches. They also use it as a defensive shield.
a hole you poo into and where they sleep
eat, sleep,eat,sleep,eat,sleep
at first they slept in lorries and later they started to sleep in the cold dirty floors of the trenches.
rats and dead bodies
A hole in the wall of a trench soldiers sleep in them.