Just to be clear, hyperfixations are not considered an official diagnostic symptom of ADHD. However, many people with ADHD identify with the experience, so I think it's still worth mentioning. Definitions may vary, but in simple terms, a hyperfixation is a bout of an extremely strong interest in something — a piece of media, an obscure subject, etc. — that goes beyond the level of just liking something. For example, when I was a kid, I often went through phases where I only wanted to watch one specific movie over and over again. During quarantine, I got so into Animal Crossing that I would play for hours and hours on end to the point where I would actually forget to eat or sleep — but now I haven't even touched the game in months. I can go from being utterly obsessed to "meh" very quickly.