Sleep quality drops during half-marathon taper week because pre-race nerves rise while lighter training leaves extra evening energy, travel disrupts routine, and early alarms fragment sleep. Fix it by protecting steady sleep across the 5-7 nights before the race instead of chasing one perfect final night. Taper week means the final 7-10 days before a half marathon when you cut mileage to arrive fresh. That rest helps legs but can leave the mind alert and the body restless at bedtime.
Medical information disclaimer: This article is for general educational purposes only and does not provide medical advice, diagnosis, or treatment. Always consult a physician or other qualified health professional about symptoms, medications, tests, or treatment decisions.
Table of Contents
- Why does sleep get worse when you run less?
- How do nerves and mood change sleep?
- Will one bad night ruin your race?
- How do you fix taper-week sleep?
Why does sleep get worse when you run less?
Lower daytime fatigue means less sleep pressure at night. Triathlete explains race-week disruption comes from pre-race nerves, lower volume with excess evening energy, and travel in the Triathlete race-week sleep guide. Unfamiliar bedrooms and early wake-ups cause late sleep onset and fragmented sleep.
An early race start often tempts you to go to bed too early. You lie awake, then sleep in broken bouts. A warm, bright, or noisy room makes fragmentation worse.
How do nerves and mood change sleep?
Anxiety and sleep problems often arrive together. A 2025 Frontiers in Psychology study of endurance and ultra-endurance runners found positive anxiety screening commonly coexisted with positive sleep-problem screening. Training schedules, intensity, caffeine, nutrition, and travel amplified the link.
Mood shows a similar link. A 2026 prospective study indexed on PubMed of 193 trail runners at La Misión Brasil 2024 found poorer sleep-quality scores moderately correlated with higher total mood disturbance and higher state and trait anxiety. In taper week, that means replaying race worries can keep you alert past lights-out.
Will one bad night ruin your race?
One restless night rarely decides a half marathon. Triathlete reports getting at least about 4.5 hours the night before generally preserves objective endurance metrics while mainly raising perceived effort. The largest impairments follow total sleep deprivation across 24-48 hours.
So protect the full week. The OC Marathon sleep and recovery guide advises prioritizing the 5-7 nights before the race rather than the final night in the OC Marathon sleep and recovery guide. Treat early nights as the real race preparation.
How do you fix taper-week sleep?
Keep bed and wake times steady across taper week. The Canadian Running Magazine taper-week guide recommends consistent bed and wake times, a screen curfew, and a cool dark quiet room in the Canadian Running Magazine taper-week guide.
Meet your normal sleep need each night rather than forcing extra hours. Sports Performance Bulletin notes evidence for pre-race sleep banking remains limited and individual, so consistent adequate sleep matters more than any single protocol promising faster performance.
- Avoid alcohol and late caffeine
- Do not try new sleep aids
- Shift bedtime 15 minutes earlier every 2-3 days for early starts
- Keep the bedroom cool, dark, and quiet