Why can you not fall asleep when you have a concussion?

After a concussion, the brain may experience disturbances in normal function, leading to symptoms like headaches, dizziness, and confusion, which can hinder the ability to fall asleep. Additionally, the brain's increased sensitivity to light and sound can create an uncomfortable environment for sleep. Anxiety and stress related to the injury can also contribute to insomnia. Overall, the physical and psychological effects of a concussion can significantly disrupt sleep patterns.