Does drinking coffee before going to bed cause insomnia? New research reveals that the sleep killer is someone else.

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Many people are used to drinking coffee to refresh themselves, and they can't sleep if they drink it too late. However, recent research has completely overturned the established beliefs of many people. A 14-year study in the United States found that drinking coffee near bedtime does not interfere with sleep, and that "alcohol" and "nicotine" are the most likely causes of insomnia. Drinking alcohol within four hours before bed is more likely to disrupt sleep than caffeine, while nicotine, which is inhaled when smoking cigarettes or e-cigarettes, especially at night, has a greater impact on insomnia.

A joint study by Florida Atlantic University, Harvard University, Emory University and Mississippi Medical Center found no strong link between coffee and insomnia, according to the Daily Mail. The study lasted 14 years and involved 785 African-Americans, none of whom had a history of sleep disorders. Each person wears a wristband sensor to monitor sleep and keep a diary of sleeping, feeling, eating, smoking, drinking and other items at night.

Although there may be mistakes in self-filling records, the researchers are confident of the consistency of the results. Even if you control other factors that may affect sleep, such as age, sex, obesity, whether you go to school the next day, depression, anxiety, stress, and so on, caffeine has little effect on sleep.

According to the subjects' reports, sleepless nights usually occur after drinking, especially when drinking very close to bedtime. Although drinking does affect sleep, it is not as good as nicotine. The study found that smokers and e-cigarettes slept an average of 43 minutes less than non-smokers.

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