Ever since it was discovered that memories get consolidated in sleep, people have attempted to take control of this process. Unfortunately, we can’t learn new facts or skills while we sleep. However, we are able to selectively boost some memories by using reminders (such as scents or sounds) during sleep. Playing such reminders induces targeted memory reactivation (TMR) and improves memory performance. However, the mechanisms of how this happens are not understood, and none of the TMR studies to date have timed the reminders to the ongoing brain activity. This project aims to induce TMR at specific sleep events, and reveal which events and brain patterns are causal to TMR improvements in memory.