Similar to reusing nonlinear storytelling as a technique, Christopher Nolan loves exploring the concept of time, specifically in Memento, Inception, Interstellar and Dunkirk.
In Memento, Leonard has no real concept of time because of his memory loss.
Inception is a sort of kindred spirit to this idea, except it’s not about memory this time, but dreams and reality.
Without the ability to make memories, he’s stuck in a loop, constantly reliving the same tragedy over and over again.