Cold Shower Before Bed? Expert Says No—Here’s Why 2026

Is a cold shower the best way to cool down on a hot night? According to sleep experts, the answer is no—and the science behind it may surprise you. If you’ve been dousing yourself in ice-cold water to beat the heat, you might be making your sleep worse.

Why Cold Showers Before Bed Backfire

Mike Tipton, a professor of human and applied physiology at the University of Portsmouth, explains that a freezing cold shower triggers a stress response. Your body releases adrenaline and cortisol, hormones designed to keep you alert. That’s the opposite of what you need before sleep.

Cold water immersion also constricts blood vessels near the skin, reducing blood flow and trapping heat in your core. This slows down your body’s natural cooling mechanism, making it harder to fall asleep.

The Science of Thermoregulation

Your body regulates temperature by moving warm blood to the skin’s surface, where heat escapes into the air. Cold water reverses this process. Instead of releasing heat, your body conserves it, so you end up feeling hotter once the initial shock wears off.

In contrast, a tepid shower (around 25-29°C) encourages blood flow to the skin, gently releasing heat without triggering a stress response. This is the ideal way to cool down before bed.

What About Heatstroke?

Very cold water is only recommended for severe heatstroke, when circulation has collapsed and rapid cooling is critical. For everyday hot nights, it’s counterproductive.

Comparison: Cold vs. Tepid Shower

Key Takeaways for Better Sleep

• Avoid cold showers before bed—they increase alertness.
• Use a tepid shower to help your body cool naturally.
• Keep your bedroom cool and well-ventilated.
• Try a cool damp cloth on your neck or wrists instead.
• Stay hydrated but avoid heavy meals before sleep.

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