The science behind the trend for showering in the dark before bed

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The latest wellness trend and “sleep hack” involves switching off the bathroom light before stepping into the shower. In the dimness, the water feels louder, the day’s visual clutter fades and the hope is that sleep will come more easily. This practice, often called “dark showering”, has spread on social media, with people claiming that washing before bed in near darkness leads to deeper and faster sleep.

There is little research on dark showering as a standalone sleep technique.