Some risk factors can make you more likely to become drowsy, including excessive caffeine and stimulant use, vigorous exercise before bed, emotional stress, and poor sleep.
Excessive use of caffeine or nicotine
Stimulants like caffeine and nicotine wake up your brain
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National Heart, Lung, and Blood Institute (NHLBI)
NHLBI is a national leader in the prevention and treatment of heart, lung, blood and sleep disorders.
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. These substances can stay in your system for hours, disrupting sleep. In one study, people stopped drinking coffee six hours before bedtime
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National Library of Medicine, Biotechnology Information
The National Center for Biotechnology Information advances science and health through access to biomedical and genomic information.
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