Pre-Workout Drinks Linked to Dangerous Sleep Loss in Young Adults

A growing body of evidence is raising concerns about the hidden cost of popular fitness supplements: sleep disruption.

A new study published in Sleep Epidemiology found that adolescents and young adults who use pre-workout supplements are significantly more likely to experience very short sleep durations—often five hours or less per night.  

Researchers analyzed data from over 900 participants aged 16 to 30, examining their supplement habits and sleep patterns. The findings were striking: individuals who reported using pre-workout products were more than twice as likely to sleep ≤5 hours compared to those getting the recommended 8 hours.  

Why Pre-Workouts Disrupt Sleep

The main culprit appears to be high caffeine content. Many pre-workout formulas contain large doses of caffeine—sometimes exceeding 300 mg—alongside other stimulants designed to enhance energy and focus.  

Caffeine is known to:

• Delay melatonin release
• Disrupt circadian rhythms
• Reduce total sleep time

The issue becomes more pronounced because many users take these supplements in the late afternoon or evening, placing stimulant intake dangerously close to bedtime.  

Beyond Sleep: Broader Health Impacts

Sleep is not just about rest—it is critical for:

• Muscle recovery
• Cognitive performance
• Emotional regulation
• Immune function

Chronic sleep restriction—especially in young people—can negatively impact both physical performance and long-term health outcomes.

Cause or Correlation?

While the study shows a strong association, it does not prove causation. Researchers note that individuals who already sleep less may be more likely to use pre-workouts to compensate for fatigue.  

Still, the strength of the relationship suggests that pre-workout use is a significant risk factor for inadequate sleep.

Practical Recommendations

Experts suggest:

• Avoiding pre-workout supplements at least 6–12 hours before bedtime
• Checking caffeine content carefully
• Prioritizing sleep as part of performance optimization  

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Why This Matters for GeneFit Readers

For GeneFit’s precision health approach, this study highlights a key principle: performance is not only about what you take—but when and how your body responds.

Genetic differences influence:

• Caffeine metabolism (e.g., CYP1A2 variants)
• Sleep sensitivity to stimulants
• Recovery efficiency

This means the same pre-workout supplement may:

• Boost performance in one individual
• Disrupt sleep and recovery in another

Personalized genetic testing can help determine:

• Your optimal caffeine tolerance
• Best workout timing
• Whether pre-workouts are beneficial—or harmful—for you

In short: better sleep = better performance = better long-term health.

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Reference

Ganson, K. T., Testa, A., & Nagata, J. M. (2025). Use of pre-workout dietary supplements is associated with lower sleep duration among adolescents and young adults. Sleep Epidemiology, 5, 100124. https://doi.org/10.1016/j.sleepe.2025.100124

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