ADHD in adults is often undiagnosed and can manifest through various symptoms, including restlessness, emotional outbursts, and difficulty concentrating. The NHS has outlined 11 common signs to help identify the condition, but emphasizes that only a specialist can formally diagnose ADHD. Sleep disorders, particularly Delayed Sleep Phase Syndrome, are also frequently linked with ADHD, causing difficulty in waking up and maintaining a regular sleep schedule. Dr. Daniel Amen's list of ten ADHD signs highlights issues such as a short attention span and poor time management, suggesting that having two or more of these signs could indicate the disorder. Awareness and early identification of ADHD symptoms are crucial for better management and treatment.