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The Effect of Noise on Sleep
Using Apple Watch
TL;DR: across every metric we examined, bedroom noise shows a consistent, dose-dependent impact on sleep quality. Once noise climbs past roughly 58–60 dB (about the loudness of normal conversation), the line kinks sharply downward—REM time falls by an additional ~15 minutes in that single step. Practically, that suggests a threshold effect: keeping bedroom sound levels beneath the low-60s dB(roughly the volume of normal conversation) is a pivotal target for preserving restorative sleep stages and the physiologic calm that goes with them.
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