Adults Cut Short-Sleep Risks With 1-2 Extra Hours, as Weekend Lie-Ins Can Backfire
Updated
Updated · BBC.com · Sep 14
Adults Cut Short-Sleep Risks With 1-2 Extra Hours, as Weekend Lie-Ins Can Backfire
1 articles · Updated · BBC.com · Sep 14
Summary
One to two extra hours of catch-up sleep appears to offer the best trade-off for adults short on weekday rest, easing some health and mood risks without heavily disrupting sleep timing.
Lab studies found recovery sleep can partly reverse short-term damage: up to 10 hours after a two-hour night nearly normalized stress-linked white blood cells, and six 12-hour nights restored glucose and insulin measures after sleep restriction.
Weekend oversleeping still carries a cost because later wake-ups reduce evening sleep pressure and shift circadian rhythms, potentially delaying Sunday sleep and restarting Monday sleep debt.
Real-world evidence is mixed but often favorable: in a 40,000-person Swedish study, short sleepers who caught up on weekends no longer showed the 65% higher mortality risk seen in those sleeping five hours or less.
The article says catch-up sleep does not erase all effects of chronic sleep loss, and people with insomnia are a key exception because lie-ins and earlier bedtimes can worsen their condition.