In the quiet hours of sleep, the brain performs its most essential housekeeping — and researchers in Boston have found a way to amplify that process. By synchronizing bursts of pink noise with the brain's own rhythmic activity, scientists have demonstrated that the glymphatic system, the brain's fluid-based waste-clearing network, can be enhanced through nothing more than carefully timed sound. The finding invites us to reconsider sleep not merely as rest, but as an active and improvable form of biological maintenance — one that may carry consequences for how we age and think.