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Sleep Week
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Evidence library

Every claim, with its source attached.

Sleep Week is a measurement program, so the standards we apply to guest data also apply to our own copy. Each statistic carries a definition, population, geography, year, source and caveat.

Citations

Sources used across this site.

Methodology

How the survey data should be read.

2024 National Health Interview Survey (NHIS)

Nationally representative household interview survey of the U.S. civilian noninstitutionalized population. Sleep measures are self-reported for the past 30 days or as usual duration. Estimates are weighted; small subgroup estimates carry wider uncertainty.

2022 Behavioral Risk Factor Surveillance System (BRFSS)

State-based telephone survey of adults. Short sleep duration is defined as fewer than 7 hours in a 24-hour period. State estimates are age-adjusted and are not directly comparable with NHIS national estimates.

Insufficient sleep is associated with higher risk of obesity, type 2 diabetes, hypertension, heart disease, stroke, anxiety and depression. Association does not prove that poor sleep is the single direct cause of those outcomes, the relationships are frequently bidirectional and shaped by other factors.

Statistics register

The full record.

Statistics register with source and verification data
StatisticPopulationGeographyYearSourceVerified
30.5% of U.S. adults averaged fewer than seven hours of sleepAdults aged 18 and overUnited States2024Centers for Disease Control and Prevention2026-07-26
15.4% had trouble falling asleep most days or every dayAdults aged 18 and overUnited States2024Centers for Disease Control and Prevention2026-07-26
18.1% had trouble staying asleep most days or every dayAdults aged 18 and overUnited States2024Centers for Disease Control and Prevention2026-07-26
54.8% usually woke feeling well-restedAdults aged 18 and overUnited States2024Centers for Disease Control and Prevention2026-07-26
12.9% used a sleep aid most days or every dayAdults aged 18 and overUnited States2024Centers for Disease Control and Prevention2026-07-26
35.2% of California adults reported insufficient sleepAdults aged 18 and overCalifornia2022Centers for Disease Control and Prevention2026-07-26

Language standards

Words we use, and words we do not.

We use

  • Designed to
  • May help
  • Screens for
  • Supports
  • Measures
  • Physician reviewed
  • Subject to clinical review
  • Proposed collaboration
  • Where clinically appropriate

We do not claim

  • Cures insomnia
  • Guaranteed better sleep
  • Diagnoses all sleep disorders
  • Replaces a sleep study
  • Johns Hopkins-approved
  • Medical-grade, unless the exact product and indication support it
  • Clinically proven, without a cited study for the exact claim
  • FDA approved, unless the specific product has that status
  • HIPAA compliant, unless the implementation has been reviewed and configured accordingly
Clinical guardrails