Hyperfocus is a state of intense absorption in a single activity, during which awareness of time, surroundings and competing responsibilities fades. It is commonly reported by people with ADHD, which involves difficulty regulating attention rather than a simple lack of it.
Hyperfocus can be productive when aimed at the right task, but it becomes a problem when meals, sleep or deadlines are missed. Clinicians often explore hyperfocus patterns during an ADHD assessment because it is a frequently overlooked feature in adults.