Researchers are uncovering more about unrefreshing sleep in ME/CFS, including its clinical features, its impact, and how it can be treated.
What is Unrefreshing Sleep?
Unrefreshing sleep is not the same thing as insomnia (which may also be present in people with this condition). It's not about how long you sleep or how hard it is to get there.
Instead, the term unrefreshing sleep is used to describe a light sleep that, even after a full night, doesn't leave you rested. People with ME/CFS often report waking up exhausted and feeling as if they haven't slept at all -- no matter how long they were actually asleep. The consequences of unrefreshing sleep go beyond mere tiredness.
Unrefreshing sleep is believed to be a problem with how your body regulates sleep, which is called sleep homeostasis. While people with ME/CFS may have sleep disorders on top of unrefreshing sleep, multiple studies support the theory that their constant fatigue stems from impaired sleep homeostasis and not from other sleep disorders.
Impact of Unrefreshing Sleep
Many symptoms of ME/CFS are theorized to stem, at least in part, from unrefreshing sleep. They include:
- Unrelenting fatigue
- Daytime sleepiness
- Poor concentration and other cognitive impairment (brain fog)
- Increased sensitivity to pain (hyperalgesia)
- General disability
Why is Sleep Unrefreshing in ME/CFS?
A couple of studies suggest that people with ME/CFS may often perceive their sleep duration and quality as worse than they appear when measured objectively during a sleep study. One of these studies showed that people with this illness were not significantly different from healthy participants in terms of the amount of slow-wave sleep or other objective sleep-quality parameters. In the other study, researchers reported no significant differences in sleep pathology or architecture between ME/CFS and healthy controls.
However, many studies have reported measurable differences in how people with ME/CFS sleep, including:
- Brain-wave abnormalities in several stages of sleep
- Significantly shortened sleep duration
- More time laying awake in bed
- Less REM sleep & other REM-related abnormalities
- Low nocturnal heart-rate variability, suggesting autonomic dysfunction
A growing body of research supports the hypothesis of autonomic dysfunction in ME/CFS. The autonomic nervous system comprises the sympathetic and parasympathetic nervous systems, which work in balance with each other. When the sympathetic nervous system is activated, it puts you into fight-or-flight mode. Conversely, parasympathetic activation is referred to as rest-and-digest mode.
If the sympathetic and parasympathetic are out of balance due to autonomic dysfunction, it could put you in a state of heightened arousal and awareness when you're trying to sleep. It's a lot like how a new parent is always on alert for a crying baby, never really getting into a good, deep sleep.
Treating Unrefreshing Sleep
Researchers haven't made a lot of headway in finding effective ways to improve sleep, and therefore alleviate fatigue and other symptoms, in ME/CFS.
A 2006 study suggested that the supplement melatonin may be effective at improving sleep in this illness. However, a 2010 review of studies states that more work is required to determine whether it's effective.
Some people with this condition report success with medications to help them sleep, including antidepressants and prescription or over-the-counter sleep aids. Others say supplements have helped them sleep better. Unfortunately, we have little-to-no quality research showing whether these treatments actually improve unrefreshing sleep in ME/CFS.
ME/CFS is believed to be similar to fibromyalgia, which also features unrefreshing sleep. The three FDA-approved drugs for fibromyalgia all have been shown to improve sleep in that condition. They are Lyrica (pregabalin), Cymbalta (duloxetine) and Savella (milnacipran). So far, none of these drugs has been studied for ME/CFS.
Doctors often recommend approaches such as learning relaxation techniques, improving sleep habits and getting help for any sleep disorders you may have.
If your ME/CFS involves pain, proper pain management may also help improve your sleep quality.
Your doctor may be able to help you explore treatment options for unrefreshing sleep.
Decker MJ, et al. Behavioral and brain functions. 2009 Oct 6;5:43. Electroencephalographic correlates of chronic fatigue syndrome.
Hamaguchi M, et al. Clinical rheumatology. 2011 Jul;30(7):895-906. Characteristics of chronic fatigue syndrome in a Japanese community population: chronic fatigue syndrome in Japan.
Kishi A, et al. American journal of physiology. Regulatory, integrative and comparative physiology. 2008 Jun;294(6):R1980-7. Dynamics of sleep stage transitions in healthy humans and patients with chronic fatigue syndrome.
Majer M, et al. BMC neurology. 2007 Dec 5;7:40. Perception versus polysomnographic assessment of sleep in CFS and non-fatigue control subjects: results from a population-based study.
Mariman A, et al. Acta clinica Belgica. 2012 Jan-Feb;67(1):19-24. Subjective sleep quality and daytime sleepiness in a large sample of patients with chronic fatigue syndrome (CFS).
Mikirova N, Casciari J, Hunninghake R. Alternative therapies in health and medicine. 2012 Jan-Feb;18(1):36-40. The assessment of the energy metabolism in patients with chronic fatigue syndrome by serum fluorescence emission.
Neu D, et al. Neuropsychobiology. 2007;56(1):40-6. Sleep quality perception in the chronic fatigue syndrome: correlations with sleep efficiency, affective symptoms and intensity of fatigue.
Rahman K, et al. Sleep. 2011 May 1;34(5):671-8. Sleep-wake behavior in chronic fatigue syndrome.
Sanchez-Barcelo EJ, et al. Current medicinal chemistry. 2010;17(19):2070-95. Clinical uses of melatonin: evaluation of human trials.
Spitzer AR, Broadman M. Pain practice: the official journal of World Institute of Pain. 2010 Jan-Feb;10(1):54-9. Treatment of the narcoleptiform sleep disorder in chronic fatigue syndrome and fibromyalgia with sodium oxybate.
Togo F, et al. Arthritis research & therapy. 2008;10(3):R56. Sleep structure and sleepiness in chronic fatigue syndrome with or without coexisting fibromyalgia.
van Heukelom RO, et al. European journal fo neurology: the official journal of the European Federation of neurologica Socieites. 2006 Jan;13(1):55-60. Influence of melatonin on fatigue severity in patients with chronic fatigue syndrome and late melatonin secretion.