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Sleep deprivation weakens memory at several stages. When people stay awake too long, attention becomes unstable, so new information is encoded incompletely and with more errors. Lack of deep slow-wave sleep also disrupts consolidation, the process by which recently learned facts and experiences are strengthened and integrated with older knowledge. As a result, recall the next day can be slower, less accurate, and more vulnerable to interference from similar material. Sleep loss can especially harm working memory, making it harder to hold instru…

Sleep deprivation can impair memory by disrupting the brain processes that encode, consolidate, and retrieve information. After learning, sleep helps stabilize new memories, particularly facts, skills, and emotionally important experiences. When sleep is shortened or fragmented, attention and working memory often decline, making it harder to take in information accurately in the first place. Lack of sleep may also interfere with communication between the hippocampus, which supports initial memory formation, and the cortex, where longer-term mem…