Sleeping like a newborn (neuron)


Adult-born neurons (ABNs) in the dentate gyrus are important for memory formation. Monitoring calcium activity in these neurons during and after a fear learning task showed that most young ABNs (4 weeks old or younger) that were sparsely active during learning were also active (at an even lower level) during post-learning REM sleep. Optogenetic silencing of these neurons during REM sleep reduced fear memory, suggesting that activity of ABNs during REM sleep contributes to memory consolidation.


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  1. Kumar, D. et al. Sparse activity of hippocampal adult-born neurons during REM sleep is necessary for memory consolidation. Neuron (2020)

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Correspondence to Sian Lewis.

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Lewis, S. Sleeping like a newborn (neuron). Nat Rev Neurosci 21, 400 (2020).

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