The HRV Story

Rest & Sleep Alone Don’t Break the Stress Loop

What my WHOOP data from a total solar eclipse trip taught me about stress, novelty, sleep, and repetitive thought loops, and HRV

For a long time, I thought stress management meant doing less.

Sit quietly. Relax. Recover. Find a way to switch everything off. Those things can help. But after studying my WHOOP data from a recent trip to Spain, I started to question whether rest alone could address the type of stress that affects me most.

My daily stress is not always caused by too much physical effort. Much of it comes from thinking about the same things again and again: the same work concerns, the same environment, and the same unresolved problems. My brain follows the same mental routes every day.

What if breaking that cycle requires more than rest? What if the brain sometimes needs a completely different type of activity? That became my personal hypothesis after five intense days around the total solar eclipse on August 12, 2026.

Five days that looked terrible on paper

From August 9 to 13, I travelled through Spain as part of a sponsored social-media trip.I filmed and presented content about the eclipse. I moved between locations, met many new people, and worked far outside my normal routine. I was deeply engaged, but I slept very little.

My WHOOP averages for those five days were:

• Average sleep: 4.4 hours per night
• Sleep performance: 35%
• Sleep consistency: 39%
• Average recovery: 40%
• Average daily strain: 14.6
• Average HRV: 68.1 milliseconds

The sleep data was clearly poor. This was not a healthy sleep experiment, and it is not a schedule I want to repeat. Yet something unusual happened during the trip.

On August 12 — the day of the eclipse — my recovery reached 92%. My HRV rose to about 101 milliseconds.

That day included many things we normally connect with stress:

• Anticipation
• Public speaking
• Social interaction
• Physical movement
• Responsibility
• Unfamiliar surroundings
• Pressure to capture a rare event

But this did not feel like my normal stress.It felt meaningful. The day required my full attention. I was not sitting at home trying to stop thinking about work. I had entered a different mental world, and the old thought loop had little room to operate.

The average hid an important detail

The data needs careful interpretation. An average HRV of 68.1 milliseconds appears high for a period with so little sleep. However, the eclipse-day reading had a large effect on that average. If I remove the reading of about 101 milliseconds, the average for the other four days falls to roughly 59.9 milliseconds. That is almost the same as my average of 59.8 milliseconds from August 3 to 7.

This changes the meaning of the data.

My conclusion is not that sleep stopped mattering. The low average recovery, short sleep, and high strain show that sleep mattered a great deal. The more interesting signal is narrower. On the most meaningful and absorbing day of the trip, my body produced an unusual response despite the difficult conditions around it. This does not prove that purpose or novelty caused the high HRV reading.

HRV can be affected by breathing, sleep, physical load, alcohol, illness, measurement conditions, and many other factors. A wearable device cannot explain the cause of a single reading. However, personal data can help us form useful questions.

My question is this:

Could meaningful change and deep engagement help me interrupt chronic stress more effectively than passive relaxation alone?

Stress is not simply “doing too much”

We often talk about stress as if every type of pressure affects us in the same way. It does not. A normal workday and an eclipse presentation can both be demanding. But they may create very different mental states. One can trap the mind in repeated worry. The other can pull attention into learning, creativity, movement, social connection, and a clear purpose.

Research shows that sleep loss can harm the body’s ability to regulate itself. It can also reduce HRV. This supports the obvious lesson: novelty cannot replace sleep. Research also suggests that perceived stress and HRV are connected, but they are not the same thing.

How stressed we feel does not always match what the autonomic nervous system is doing at that moment. This helped me understand the Spain trip. Mentally, I felt renewed. Physically, I was building sleep debt. Both can be true at the same time.

I don’t need to escape effort. I need to escape the same pattern of effort.

This was the most important lesson I took from the experience. My answer may not be to remove all stimulation. It may be to find a better kind of stimulation. I need experiences that are new, challenging, and absorbing enough to interrupt my normal cycle of concern.

I use the word “rewire” with care. One new experience does not magically rebuild the brain. But repeated new experiences can train attention and mental flexibility. They can help us practice different responses to familiar stress.

A useful activity may require the brain to:

• Learn a skill
• Explore a new place
• Meet unfamiliar people
• Solve a different problem
• Create something
• Adjust to uncertainty
• Focus on a meaningful goal

Passive relaxation does not always stop repetitive thinking. The body may be still while the mind continues to rehearse the same problem. Meaningful learning works differently. It competes for attention. It gives the brain a new problem to solve. For me, a strong interruption to the stress cycle may include several of these elements:

• A new environment
• A skill I have not mastered
• Physical movement
• Social interaction
• Creative work
• A meaningful goal
• Moderate uncertainty
• A visible result

The eclipse trip contained all of them at once.

Conclusion: The goal is flexibility

[Insert Graph 3: Repetitive stress loop → novelty and learning → cognitive flexibility here]

The goal is not to remain calm all the time. It is also not to remain excited or productive all the time. The goal is flexibility: the ability to move between states.

I want to prepare for something meaningful, become fully absorbed in it, and then return to rest. I do not want to carry the same thought loop into the next day. I still need sleep. My WHOOP data makes that clear. But the data also suggests that my approach to stress should include more than trying to switch off.

Sometimes I need to switch into something:

A new problem. A new place. A new skill. A new group of people. A mission strong enough to reorganise my attention.

Perhaps the opposite of chronic stress is not inactivity.

Perhaps it is flexibility — the freedom to leave one mental world and enter another.

Notes and sources

This article describes a personal observation, not a medical conclusion. The WHOOP values were taken from my WHOOP Coach conversation rather than recalculated from a raw data export.

• Zhang S. et al., “Effects of sleep deprivation on heart rate variability,” systematic review and meta-analysis, 2025: PubMed
• Martinez G. et al., “Perspectives From a Large-Scale In Situ Longitudinal Study of the Relationship Between Perceived Stress and Heart Rate Variability,” 2022: PubMed
• Makovac E. et al., “Resting heart rate variability longitudinally predicts emotion regulation and perceived emotional support,” 2022: PubMed
• Stephenson M.D. et al., “Applying Heart Rate Variability to Monitor Health and Performance,” 2021: PMC