The pajama dash to the wrong cabin at 3am

All the corridors look the same at 3am when you have had too many drinks at the piano bar. I spent a solid four minutes trying to open cabin 9318 with my key card before the door opened from the inside and a very confused elderly man in a bathrobe asked if I was lost. I was on the wrong deck entirely. My cabin was 10318. The man was incredibly kind about it — said it happens at least once per cruise in his experience. He pointed me to the elevator and wished me goodnight. I have never been more embarrassed in my life. The next day I bought a bright orange luggage tag and attached it to my key card lanyard so I could see my deck number clearly. The casino should come with a navigation warning.