The role of sleep in strengthening face learning and memory consolidation: A systematic review

Sleep plays a crucial role in memory consolidation, particularly for complex, hippocampal-dependent tasks, such as associating faces with names. While numerous studies have examined the impact of sleep on memory, the specific effects on episodic face recognition, perceptual face processing, and the underlying neural mechanisms remain unclear.

Thus study was designed to systematically evaluate the role of sleep in face recognition memory, learning, and consolidation in humans.

A systematic search of PubMed, Google Scholar, Embase, Scopus, and Web of Science identified English-language, peer-reviewed studies published up to February 5, 2026. The authors independently screened articles, extracted data, and cross-verified results. The review adhered to PRISMA guidelines to maintain methodological rigor and transparency.

Across 19 included studies, overnight sleep, post-learning sleep, and targeted naps showed the strongest benefits for face-related learning and memory, particularly in associative and hippocampal-dependent tasks, such as face-name and face-face memory. Slow-wave sleep/N3 and targeted memory reactivation were associated with improved cued face-name recall, while REM sleep and sleep spindles appeared to contribute to implicit face priming, emotional face memory, and adaptive face-learning processes. Sleep deprivation and sleep restriction generally impaired face-memory performance, particularly when tasks required episodic retrieval, associative binding, emotional discrimination, or sustained cognitive control. In contrast, simpler face-recognition or familiarity-based tasks showed weaker and less consistent sleep-related effects, often suggesting protection against forgetting or interference rather than robust memory enhancement.

Sleep mainly benefits face learning when tasks require binding, episodic retrieval, emotional processing, or consolidation, while simple familiarity recognition shows weaker effects.