Dopamine and the neurobiology of compulsive scrolling

Dopamine plays a critical role in human motivation, learning, and the anticipation of rewards. While often simplified as the ‘happiness hormone,’ it is actually a neurotransmitter that helps the brain identify which actions are worth repeating to achieve a desired outcome.

This neurobiological mechanism contributes to compulsive nocturnal scrolling on social media. The combination of constant novelty, immediate reward, and uncertainty—not knowing what content will appear next—keeps the brain’s reward system active. This cycle often leads individuals to lose track of time, delaying sleep and negatively impacting rest quality.