However, caffeine more negatively affected the participants who slept during the day. Both groups ingested 200 mg of caffeine before bedtime.īoth groups experienced sleep disturbances, including difficulty falling asleep, compared with those who took a placebo. In a 2006 study in 34 people, half of the participants followed a standard sleep routine of sleeping at night, while the other half stayed up at night and slept during the day. Studies show that using caffeine to stay awake for night shifts and to shift sleep to the following day may lead to significantly decreased sleep quality overall. If you’re using caffeine to stay awake, say for a night shift, it might not be the best plan.
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