Pre-workout supplements that are supposed to increase energy during exercise can significantly reduce sleep quality. A study of participants aged 16 to 30 found that users of these supplements were more than twice as likely to sleep five hours or less per night. Many of these products contain high doses of caffeine and other stimulants that can work in the body for several hours. Caffeine and stimulants taken in the late afternoon or evening can disrupt sleep, so it is recommended to take pre-workout supplements at least 4 to 6 hours before bedtime.[1][7] The researchers warn that these findings raise concerns about the potential impact on the health and development of young people. Quality sleep is key for regeneration and energy restoration, while it is recommended to sleep 7 to 9 hours a day.[1]