Sleep & Injury Risk, the recovery you cannot skip
Trail Notes | Recovery & Injury Prevention
the recovery you cannot skip
Sleep
& Injury Risk.
You can follow the program, complete the strength work and manage your kilometres carefully, yet still struggle to absorb the training if your sleep is repeatedly disrupted.
Sleep is part of how your body recovers from training. It supports tissue repair, immune function, learning, coordination, mood and your ability to make good decisions when tired.
It is not the only factor that influences injury risk, and one poor night does not mean you will get injured. But when poor sleep becomes a pattern, it can reduce the recovery capacity you bring to the next session.
Poor sleep does not automatically cause an injury. It may, however, be a sign that your capacity to absorb training is changing.
That makes sleep worth noticing alongside training load, soreness, fatigue, fuelling and life stress.
Trail Note · 01
What the running research found
A 2025 study followed 339 adult runners for 26 weeks. Each week, the runners reported their sleep, fatigue, stress, muscle soreness and any running-related injuries. Their training load was also recorded through their personal watches.
Poorer reported sleep quality was associated with a higher risk of running-related injury. Each one-point worsening on the weekly sleep-quality scale was associated with a 36% increase in injury risk. Increased muscle soreness and fatigue also appeared in the weeks immediately before some injuries.
A separate study of 425 recreational runners identified different sleep profiles based on sleep duration, quality and sleep problems. Runners classified as Poor Sleepers had 1.78 times the odds of reporting an injury compared with Steady Sleepers.
The research points to an association, not a guarantee that poor sleep will cause an injury.
There are also important limitations. The second study collected sleep and injury information through a survey, so it cannot show which came first. In the 26-week study, only 16.2% of participants were women. The findings are useful, but they should not be treated as a complete explanation of injury risk for female runners.
Trail Note · 02
Why sleep matters for trail runners
Running injuries rarely come from one isolated cause. They usually emerge from an interaction between the load placed on the body and its current capacity to tolerate, repair and adapt to that load.
Sleep contributes to that capacity in several ways:
Physical recovery: Sleep supports processes involved in repairing and remodelling muscles and other tissues after training.
Coordination and decision-making: Poor sleep can affect reaction time, concentration and motor control. These matter when descending, moving across technical terrain or making decisions late in a long run.
Perception of effort: Training can feel harder after poor sleep, even when the session itself has not changed.
Recovery choices: When exhausted, it can be harder to fuel well, complete strength work, regulate pace or recognise when the body needs an adjustment.
Trail Note · 03
Quality and duration both matter
Sleep is more than the number of hours between getting into bed and waking up. How easily you fall asleep, how often you wake, whether you can return to sleep and how refreshed you feel in the morning all contribute to the picture.
The prospective running study found a significant association with reported sleep quality, but not with sleep quantity in its particular model. That does not mean sleep duration is unimportant. It means that counting hours alone may miss disruption happening within those hours.
If you have enough opportunity to sleep but regularly wake unrefreshed, feel unusually heavy in training or struggle to recover, it is worth looking beyond the number shown by your watch.
Trail Note · 04
The perimenopause layer
Sleep disruption is common through perimenopause and menopause. Hot flushes, night sweats, changing mood, anxiety and hormonal changes can all make it harder to fall asleep, stay asleep or wake feeling restored.
For a trail runner, this can overlap with training fatigue, work, parenting, caring responsibilities and the physical changes that can occur through this stage of life. The answer is not to assume that every difficult session is hormonal. It is to recognise that the same training load may feel different when recovery conditions have changed.
If recovery feels harder than it used to, that is not a failure of discipline. It is information you can use to adjust the support around your training.
Trail Note · 05
What to notice across the week
One poor night is part of life. The more useful information comes from patterns. Look at sleep alongside the way your body is responding to training.
Signs your recovery capacity may be changing
- Regular difficulty falling asleep or returning to sleep
- Waking unrefreshed despite allowing enough time for sleep
- Persistent fatigue or heavy legs across several sessions
- An easy pace feeling unusually difficult
- Soreness lasting longer than it normally would
- More irritability, poor concentration or low motivation
- Repeated niggles, illness or difficulty adapting to training
- Night sweats, hot flushes or restless legs repeatedly disturbing sleep
These are not diagnostic signs of a sleep disorder or a future injury. They are prompts to look at the full picture rather than pushing through automatically.
Trail Note · 06
How to respond after poor sleep
You do not need to cancel training after every difficult night. Start by considering the session, the terrain and how you feel once you begin moving.
Her Trails adjustment guide
After one disrupted night: Begin gently, extend the warm-up and use effort rather than pace. You may find that the body settles.
If fatigue remains high: Reduce the intensity, choose a less technical route or shorten the session. Avoid forcing speed or technical descending when concentration and coordination feel impaired.
After several poor nights: Look at the whole week. Moving a hard session, replacing it with easy movement or taking a rest day may protect the quality of the sessions that follow.
If pain is changing your movement: Do not use sleep as the only explanation. Reduce the load and seek appropriate clinical guidance.
Adjusting a session is not the same as abandoning the program. It is part of responding to the athlete who arrived today, not the version of her that existed when the week was written.
Trail Note · 07
Support the sleep you can influence
Not every sleep barrier can be solved with a better bedtime routine. Young children, shift work, pain, perimenopausal symptoms and medical conditions can all disrupt sleep. There is no value in turning sleep into another measure of perfection.
Focus on the areas that are realistic for you:
Create enough opportunity: Work backwards from when you need to wake and allow a realistic window for sleep.
Keep timing reasonably consistent: A regular sleep and wake rhythm can make it easier for the body to know when to become alert and when to wind down.
Consider session timing: If hard evening training regularly leaves you alert at bedtime, move it earlier where possible or build in a longer transition afterwards.
Notice alcohol and caffeine: Alcohol may make you feel sleepy while disrupting sleep later in the night. Caffeine can remain active for hours, although sensitivity varies between people.
Fuel the work: Going to bed hungry after a demanding session can also interfere with recovery. Eat enough across the day and recover properly after training.
Build a short transition: Dimmer light, a shower, gentle mobility, reading or a few quiet minutes can help signal that the active part of the day is ending.
When to seek support
Speak with your GP if sleep problems are persistent, significantly affect daytime function or are not improving with simple changes.
Loud snoring, pauses in breathing, waking gasping, severe daytime sleepiness or uncomfortable sensations in the legs at night also warrant medical attention.
If hot flushes or night sweats are regularly disturbing your sleep, ask about the hormonal and non-hormonal treatment options available. You do not have to simply tolerate the disruption.
Final Trail Note
Sleep belongs in the training picture
Sleep does not have to become another score to perfect. Use it as context.
If sleep has been disrupted, notice how your body responds. If fatigue, soreness and poor sleep begin moving together, consider whether the training needs to shift. If the disruption persists, seek support rather than normalising it.
The strongest athlete is not the one who ignores every signal. It is the one who understands which signals matter and knows how to respond.
Her Trails coaching cue
Do not judge your sleep by one night or your training by one session. Look for patterns across sleep, fatigue, soreness, mood and performance. That is where the useful information lives.
train it. fuel it. sleep it.
Written by the Her Trails coaching team
Trail Notes are evidence-informed coaching journals written for women who train, race and run on trails.
Research informing this Trail Note
Goldberg et al. (2025), Poor Sleep Quality Is Associated With an Increased Risk of Running-Related Injuries: A Prospective Study of 339 Runners Over Six Months.
de Jonge and Taris (2025), Sleep Matters: Profiling Sleep Patterns to Predict Sports Injuries in Recreational Runners.
Keep going with us
General education only, not medical advice. Sleep disruption, persistent fatigue and pain can have many causes. Seek individual advice from an appropriately qualified health professional where needed.
