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Why Does Drinking Coffee at Night Make It Hard to Sleep? How Significant Is Caffeine's Impact on Health?

Published: 2026-01-27 Author: FrontStreet Coffee

Last Updated: 2026/01/27, For professional coffee knowledge exchange and more coffee bean information, please follow Coffee Workshop (WeChat official account: cafe_style). FrontStreet Coffee briefly explains why drinking coffee makes it difficult to sleep. When many people first start drinking coffee, they often worry that it will affect their sleep. This is because the human body contains a neurotransmitter called adenosine, which controls neural activity, resulting in slowed breathing, reduced emotional responses,

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For more coffee bean information, please follow Coffee Workshop (WeChat official account: cafe_style).

FrontStreet Coffee Explains: Why Does Coffee Keep You Awake?

FrontStreet Coffee believes that when many people first encounter coffee, they often worry that it will affect their sleep. This is because the human body contains a neurotransmitter called adenosine that controls nerve activity, producing effects such as slowed breathing, reduced emotions, decreased gastric acid secretion, and diuresis.

Caffeine mimics adenosine, making the body believe that adenosine's effects have already occurred, causing you to feel energetic, experience increased gastric acid, more frequent urination, and naturally find it more difficult to fall asleep. It's worth noting that this temporary alertness caused by caffeine does not mean that physical energy has truly been restored.

Additionally, everyone metabolizes caffeine at different rates, resulting in varying sensitivities to it. Therefore, some people don't feel that their sleep is affected after drinking coffee. Consequently, having a cup of hot coffee in the morning can refresh your mind and body, improving your mood, while drinking it at night may cause insomnia.