By Vijay Kumar Malesu Reviewed by Lauren Hardaker Dec 5 2025 New research shows that young Canadians who take pre-workout supplements are more than twice as likely to sleep five hours or less, raising new questions about how workout stimulants may be affecting recovery, mood, and next-day performance. Study: Use of pre-workout dietary supplements is associated with lower sleep duration among adolescents and young adults . Image credit: adriaticfoto/Shutterstock.com In a recent study published