Why You Should Never Leave a Glass of Water on Your Bedside Table

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Why You Should Never Leave a Glass of Water on Your Bedside Table

We all do it.

You fill a glass of water before bed, place it on your nightstand, and think nothing of it. It’s just a simple, harmless habit—right?

Not exactly.

While it may seem like a smart way to stay hydrated during the night, leaving a glass of water on your bedside table could actually pose more risks than benefits. From contamination to reduced water quality, here’s why this seemingly innocent habit might not be as safe—or healthy—as you think.

1. Your Water Might Get Contaminated Overnight

That glass of water left uncovered is an open invitation for dust, bacteria, pet hair, or even tiny insects. And unless you live in a completely sealed, sterile environment (spoiler: you don’t), particles from the air can—and do—settle into your water while you sleep.

Dust, spores, and even small bugs could make their way into your glass without you even noticing. You might not taste them, but you’re still drinking them.

2. It Could Absorb Carbon Dioxide and Taste “Off”

Water that sits out for hours, especially in an open glass, can absorb carbon dioxide (CO₂) from the air. This CO₂ can then react with the water to form carbonic acid, which slightly lowers the pH of the water.

While it won’t necessarily harm you, it can alter the taste, making your water seem flat, stale, or slightly sour. Not exactly the refreshing sip you were hoping for at 2 a.m.