I think it's quite interesting the way Nolan shows, let's say, his perspective about memories and mental illness, Leonard's sickness is physical, but still, it has a great reminiscence with post traumatic stress, which, without the hit he received, he would probably have suffered anyway after the attack. I couldn't stop relating this movie with Fight Club. The way Leonard seemingly covers his own acts and memories as someone else's. Apart from that, my goal as I watched the movie was to analyze it technically, in my opinion Nolan did an amazing job with Memento, with his mix of different resources, he always tells amazing stories.
I think I should watch it again though, to fully understand everything and take in every detail.