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How long it takes to fall asleep after lights out — typically 10–20 minutes in healthy sleepers.
Sleep latency is the time between trying to sleep and actually falling asleep. A healthy range is roughly 10–20 minutes. Consistently falling asleep in under 5 minutes can signal sleep deprivation, while routinely taking more than 30 minutes can indicate insomnia or a circadian-rhythm issue. It is a common endpoint in sleep-aid trials.