Sleep debt accumulates when sleep duration consistently falls below individual need. Even one week of sleeping 6 hours nightly creates measurable cognitive impairment equivalent to 24 hours of total sleep deprivation. Reaction time, decision-making and physical performance all decline significantly with sleep debt — studies show athletes with sleep debt have lower sprint speed, accuracy and endurance. Recovery requires more sleep than the deficit alone: catching up on sleep improves performance rapidly but full neurological recovery takes longer than simple debt repayment.
Key points
- Cumulative shortfall from sleep need
- One week of 6hr nights = 24hr deprivation equivalent
- Impairs reaction time, accuracy, endurance
- Recovery requires sustained adequate sleep