Sleep disruption

Caffeine

Caffeine can disturb sleep, especially with higher or later intake.

moderate evidence

Direction: increase

Magnitude: unknown

Human evidence reviewed

Study context

Population: Adults

Studied dose: Varies or not established

Duration: Varies across reviewed studies

Last reviewed: 2026-09-16

Limitations & caveats

  • Timing and tolerance matter.

Sources

NIH ODS: Dietary Supplements for Exercise and Athletic PerformanceExpert or government fact sheet · NIH Office of Dietary Supplements · supportsOpen ↗

Source type and claim strength are separate. A fact sheet summarizes underlying research; its link is not an individual clinical trial.