Showering in the dark is going viral, and I can see why

The latest trend on social media, dark showering, touches on two elements that are important for falling asleep: body temperature and light

On TikTok and Instagram, it’s showing up more and more: people showering in the dark shortly before bedtime. Just warm, running water and darkness. They claim that dark showering helps them fall asleep faster.

I can see why this trend is going viral. Dark showering isn’t strongly backed by scientific evidence, but it does tap into two mechanisms that countless sleep studies support as important for how quickly your body can transition from day to night: light and body temperature.

Your biological clock is more sensitive to light than you might think. Bright light in the evening—even regular indoor lighting—signals to your brain that it’s still daytime. This can delay the production of melatonin, the hormone that helps set your internal clock for sleep.

The bathroom may actually be one of the worst places to be before bedtime. Mirror lights, ceiling spots, bright white lighting—it can all be quite disruptive to your melatonin production.

Why warm water helps you cool down

It sounds paradoxical, but it’s true: a warm shower or bath can help your body cool down faster. Your body temperature needs to drop by a few tenths of a degree before you can fall asleep. Heat right before bedtime speeds up this process by increasing blood flow to your hands and feet, allowing heat to dissipate more quickly.

Research shows that people who take a warm bath or shower one to two hours before bed tend to fall asleep faster on average. The effect is modest but consistent. Tip: turn the water to a neutral temperature for the last minute—this can slightly speed up the cooling process even more.

What dark showering combines

Showering in the dark tackles both factors at once: less light to suppress melatonin, combined with warmth that kickstarts your body’s cooling process. An added bonus is that the sound of running water can help calm your nervous system. Your heart rate drops, and your mind becomes quieter.

Dark showering isn’t a miracle cure for chronic insomnia. But if you consistently fall asleep late and brush your teeth every night under very bright bathroom lighting, this is a sleep hack with a solid foundation.

The takeaway: evening light is underrated

It’s also worth taking a closer look at the kind of light you expose yourself to in the two hours before bedtime. Dimmable LED lights, warmer color tones, fewer spotlights—small adjustments can already make a big difference.