Topic: sleep depth

The interaction between sleep function and memory processing is widely observed in both animals and humans, especially in how sleep supports memory consolidation and forgetting. However, whether memory activity during sleep has any regulatory effect on sleep processes is poorly investigated. Here we find that sensory stimuli-triggered emotional memory reactivation significantly affects sleep strategies after learning, as negative memory promotes alertness in sleep while positive memory protects sleep from perturbation. By combining EEG/EMG recording and engram cell activity tracing, our data r