Spaced Repetition
Spaced repetition is a learning technique that schedules review of material at increasing intervals, exploiting the spacing effect to maximise long-term retention with minimal total study time. The method was pioneered computationally by Dr Piotr Wozniak through his SuperMemo software (1987–present).
The connection to sleep is fundamental: each review-then-sleep cycle consolidates the memory trace further into long-term cortical storage. Sleep-dependent memory consolidation is the biological mechanism that makes spaced repetition work — without adequate sleep between reviews, the spacing effect collapses.
SuperMemo’s built-in SleepChart tool tracks the relationship between sleep patterns and recall performance, providing empirical evidence that sleep quality and timing directly predict learning outcomes.
Connections
- sleep-and-learning — sleep is the consolidation engine that spaced repetition relies on.
- compound-interest — spaced repetition is compound interest applied to knowledge.
- source—good-sleep-good-learning — Wozniak’s article on the sleep-learning connection, informed by decades of SuperMemo data.