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Geoff’s Narrations

The GIST

The Blog

 

The GIST

  • Almost everyone with this disease experiences non-restorative/non-refreshing sleep and indeed, non-refreshing sleep is one of the core criteria of ME/CFS.
  • For me, my scores on my Oura ring suggest sleep plays a major role, indeed. My readiness scores – in part a reflection of autonomic nervous system functioning – are highly correlated with my sleep scores but my activity scores are not.  Sleep, not activity, is most impacting my “readiness” according to the Oura ring.
  • Dr. Mullington, a Harvard Medical School sleep researcher, has long been interested in ME/CFS – and now due to Open Medicine Foundation funding, she’s engaged in a rare, comprehensive sleep study that’s examining sleep in ways that have never been done before.
  • She will attempt to determine how sleep quality affects fatigue. This is the first study to assess orexin-A – a wide-ranging neuropeptide that affects nighttime and daytime sleepiness – in the cerebral spinal fluid. Twenty-four-hour cortisol and melatonin levels, EEG (electrical brain wave) activity, sleep fragmentation, and other factors will also be assessed.
If sleep is what we do to feel better, it hasn’t been doing its job very well in chronic fatigue syndrome (ME/CFS). Almost everyone with this disease experiences non-restorative/non-refreshing sleep and indeed, non-refreshing sleep is one of the core criteria of ME/CFS.

At least for me, sleep appears to loom larger than any other factor regarding my autonomic nervous system. I would have thought that activity would be a key factor, but my readiness scores on my Oura ring are far more correlated with my sleep scores (total sleep, sleep latency, efficiency, timing, REM, and deep sleep) than with my activity levels (steps per day, calories burned).

sleepy woman

Unrefreshing sleep is one of the core criteria for ME/CFS.

(Note that some correlation is built in, as some of the same factors are used to develop both scores. Sleep: total sleep, sleep latency, efficiency, timing, REM, and deep sleep. Readiness: resting heart rate, HRV balance, temperature, recovery index, sleep, sleep balance, sleep regularity, previous day activity, activity balance.)

The Oura ring is not some magic tell-all ring. Because it focuses on basic autonomic nervous system, activity, and sleep measures, it can only give us limited data points about what’s going on in ME/CFS.

In general, it’s been a pretty good indicator of functionality for me – and less so for symptoms. I’ve had high readiness scores and been highly symptomatic and vice versa, but generally, it tracks.

At one point the ring told me a cold was coming the day before it showed up.

The Virus and the Oura Ring: An ME/CFS – Fibromyalgia Experience

Activity /Readiness Score Correlation – Oura Ring

This was a big shock – no correlation between activity levels and readiness scores! I did not see that coming. My activity score (blue) is pretty consistent, but look at the occasional big drops and rebounds in my readiness score (black) during times when my activity levels have not changed.

Oura ring - activity/sleep correlation

My activity levels are not correlated with my sleep scores on the Oura ring.

 

My sleep scores (black) on the other hand, are highly aligned (r:.70) with my readiness scores (blue): they track them amazingly well. This suggests that improving my sleep could be quite beneficial. Interestingly, my partner’s sleep scores do not track with her readiness scores.

Oura ring- sleep readiness level correlation

My sleep scores are highly aligned with my readiness scores on the Oura ring.

 

Major ME/CFS Sleep Study Underway

Given that, it was very good to see the Open Medicine Foundation fund a small but extensive examination of sleep in ME/CFS. The leader of the study, Janet Mullington PhD, is a professor of neurology at Harvard Medical School and is doing her study at the Beth Israel Deaconess Medical Center.

She was the senior author of a review paper on chronic pain and sleep, orexin and sleep, and has conducted several studies on sleep and inflammation and sleep and circadian rhythms. In her book chapter, “Causes and Consequences of Chronic Sleep Deficiency and the Role of Orexin,” Mullington’s description of the brain fog associated with insomnia rings true for ME/CFS patients:

“The brain fog, the dragged down feeling, and the lack of energy and motivation or ability to do much of anything, the bodily discomfort and irritability, are all symptoms of insufficient or deficient sleep that most of us have experienced, at least transiently.“

The Open Medicine Foundation Study

Janet Mullington PhD

Dr. Mullington has long been interested in ME/CFS.

With the first major sleep study characterizing ME/CFS underway, I wanted to talk to Dr. Mullington about the study and her interest in sleep and ME/CFS.

It turned out that Dr. Mullington has been interested in chronic fatigue syndrome (ME/CFS) for a long time. Acquiring funding, though, has been challenging, and indeed, studying the disease is difficult, as patient experiences and symptoms can vary greatly. Additionally, many individuals with ME/CFS take several medications that can confound results and complicate data analyses.

One goal of the study is to find a signature of sleep disturbance-associated fatigue associated with non-refreshing sleep in people with ME/CFS. Fatigue, of course, can be produced in several ways, but this study is unusual in its attempt to determine how poor sleep specifically impacts fatigue in these diseases. Given my correlation between sleep and readiness scores, I’ll be very interested to see how this study turns out.

The Cortisol Question: Is it Really Low?

Previous studies have found that low salivary morning cortisol levels in ME/CFS could contribute to symptoms of fatigue, weakness, salt cravings, and low blood pressure, as well as immune dysregulation. This immune dysregulation found could also lead to the increased inflammation noted by many ME/CFS and long-COVID patients.

A potential confounding variable exists, however. The delayed circadian rhythms some ME/CFS patients experience could lead to cortisol peaks that occur later in the day than usual. This is caused by insomnia-induced hypersomnia (excessive daytime sleeping) characterized by late daytime awakenings.

These altered sleep patterns could result in artificially low morning cortisol levels. Since Dr. Mullington’s study will explore diurnal rhythms and measure cortisol levels throughout the day and night, she’ll be able to provide clarity on a key factor in ME/CFS.

Assessing Melatonin

Circadian rhythym

Dr. Mullington will be determining what effects alterations in the circadian rhythm are having on cortisol, melatonin and other sleep factors.

Melatonin is another hormone that has a 24-hour rhythm that will be assessed in this study. A literature search indicates sleep is only one of the many factors melatonin affects. A highly effective antioxidant, melatonin reduces oxidative stress in the mitochondria, has anti-inflammatory and immune-regulating properties, and may also have neuroprotective benefits, as melatonin levels are often decreased in many neurodegenerative disorders.

Despite its widespread use as a supplement to improve sleep, few studies have assessed melatonin levels in ME/CFS patients. One small study found that ME/CFS patients had higher night-time melatonin levels than normal. Another study found melatonin levels did not differ between ME/CFS patients and controls.

Clinical trials have had mixed results as well. One study suggested melatonin-zinc supplements may help reduce fatigue, while others found melatonin supplements were ineffective in regulating circadian rhythms or reducing symptoms. One small study found that melatonin helped reduce symptoms of fatigue in a specific subset of ME/CFS patients: people who had later sleep times and a later onset of melatonin production.

Another interesting study that compared melatonin supplements with aglomelatine, an antidepressant that can activate melatonin receptors, found that agomelatine reduced fatigue, while melatonin had no impact. That suggested that the issue with melatonin in ME/CFS may lie not in melatonin production but in how melatonin receptors respond to the hormone.

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Dr. Mullington’s assessment of melatonin level changes over 24 hours will help tell us what’s going on with this important factor in ME/CFS.

Daytime Sleepiness and Orexin-A 

Dr. Mullington – who, as was noted earlier, wrote a book chapter about the role orexin plays in sleep – will be the first to measure a neuropeptide called orexin-A in ME/CFS patients’ cerebrospinal fluid samples.

The hypothalamus monitors body homeostasis and regulates various behaviors such as feeding, thermogenesis, and sleeping.

Orexin neurons project across the central nervous system. (Image from “The physiological role of orexin/hypocretin neurons in the regulation of sleep/wakefulness and neuroendocrine functions” by Ayumu Inutsuka, Akihiro Yamanaka. CC 3.0 Wikimedia Commons)

Orexin A is no slouch of a neuropeptide. Orexin-containing neurons project from the hypothalamus across many parts of the brain. These regions communicate with neurons involved in producing three factors – histamine, dopamine, and norepinephrine – that are important in sleep and maybe major factors in ME/CFS overall. If orexin is “off”, then much trouble could result.

Orexin typically follows a circadian rhythm, peaking during wakefulness and declining during sleep. Some researchers have proposed that orexin modulates the transitions between sleep stages and may inhibit REM or dream sleep at night.

As orexin plays an important role in regulating wakefulness, its dysfunction is implicated in narcolepsy—a sleep disorder characterized by excessive daytime sleepiness and sudden sleep attacks. In patients with narcolepsy, dysregulated REM sleep at night may produce daytime wakefulness – leading to the sudden sleep attacks seen in the condition.

The connection to narcolepsy is interesting to note, as I spoke with a doctor who believes narcolepsy is far more common in ME/CFS than suspected. Before it became difficult to get, this doctor reported that he successfully treated his and his patients’ excessive daytime fatigue with Xyrem (sodium oxybate), a drug used to treat narcolepsy. While the precise mechanism is not fully understood, the drug is thought to help regulate the transitions between sleep stages. Sodium oxybate may also increase the size of orexin-containing neurons, suggesting a relationship between the drug’s function and orexin.

Besides the sleep/wake cycle, orexin is also involved in energy homeostasis and autonomic nervous system regulation. Additionally, because of orexin’s role in wakefulness and alertness, low orexin levels may be implicated in cognitive function. Some studies have found a relationship between decreased orexin levels and attention deficit hyperactivity disorder (ADHD) – a condition that may have a high comorbidity with ME/CFS. A small, double-blind crossover study found that suvorexant increased sleep time and reduced pain sensitivity in patients with fibromyalgia.

On the flip side, orexin is a common drug target for anti-insomnia medications. Because several FDA-approved drugs (suvorexant (Belsomra), lemborexant (Dayvigo), and daridorexant (Quviviq)) reduce orexin activity to promote sleep, this study could point to new opportunities for sleep drugs.

Poor Sleep – a Metabolic Risk Factor for ME/CFS?

Poor sleep

Could poor sleep be impairing glucose metabolism in ME/CFS?

Dr. Mullington noted that sleep deprivation leads to slowed glucose metabolism – a potentially significant issue for people with these diseases. Given our low activity levels and poor sleep, people with ME/CFS may be at an increased risk for metabolic disorders like diabetes and metabolic syndrome.

Factors like glucose metabolism have rarely been assessed and certainly not during sleep. A 2003 study found decreased cerebral glucose metabolism in about half of the ME/CFS patients. A 2010 CDC study, which never got the attention it deserved, found that people with ME/CFS were twice as likely to have metabolic syndrome – and that having metabolic syndrome was associated with worsened fatigue.

Additionally, studies indicate that quality of sleep is a risk factor for developing diabetes. Insufficient sleep duration and a decreased amount of time spent in deep sleep – two potential problems in ME/CFS –  that are being assessed in this study are often associated with diabetes. The brain patterns Dr. Mullington is looking at during deep sleep may be linked to developing insulin resistance as well.

  • A blog on metabolic disease risk in ME/CFS/FM and long COVID is coming up

EEG: the Spindle – Learning Connection

Lastly, Dr. Mullington will be using an EEG to look for changes in the spindle formation and other factors during sleep. During NREM sleep, spindle activity helps limit the external sensory input the brain receives to encourage restful, uninterrupted sleep. Sleep spindles also play a key role in moving the short-term memories gathered during the day into long-term storage where they facilitate learning. If it seems like you have to relearn things again and again, poor spindle activity during sleep could be why.

]In individuals with ME/CFS, spindle activity (and learning) may be disrupted and result in poor sleep quality. Additionally, understanding brainwave patterns using EEG may provide more insights into the metabolic issues mentioned above.

Conclusion

It’s amazing how little attention a core symptom like unrefreshing sleep has received in ME/CFS. Besides providing more data on circadian rhythm changes, melatonin, EEG, and basic sleep parameters, this small but thorough Open Medicine Foundation-funded study will assess cerebral spinal fluid orexin-b, neuroinflammatory biomarkers, and sleep spindle activity.

The Open Medicine Foundation reported that early results suggest that increased sleep fragmentation – which has been associated with daytime fatigue – and sleep spindle deficiency have been found. The array of factors this study is looking at could tell inform us about symptoms like fatigue, arousal, attention, daytime sleepiness and problems learning.

Dr. Mullington’s Beth Israel Deaconess Medical Center ME/CFS study is currently enrolling and anticipates finishing enrolment in the summer of 2025, with results to be available by the end of the year.

Health Rising Donation Drive Update

Doctor and piggy

Sleep is one of the core issues in ME/CFS – that’s why we cover it whenever we can.

Thanks to the over 200 people who have supported Health Rising in our year-end donation drive :).

Although sleep is one of the core criteria for ME/CFS and is almost universally poor, it hasn’t received nearly the study it deserves.

That’s why when a ME/CFS sleep study by the Open Medicine Foundation showed up we jumped on it.

Health Rising has produced many blogs on sleep and another one is coming up.  If that supports you please support us.

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