What does chronic sleep deprivation do to your inflammation in the long run?

Chronic sleep deprivation measurably raises the levels of inflammatory markers in the blood. In a study of resident physicians who structurally slept too little, hs-CRP values (a blood marker for inflammation) were clearly higher than in well-rested colleagues. A controlled laboratory experiment with 17 healthy adults showed that weeks of disrupted day-night rhythm led to significant increases in both pro-inflammatory substances (such as TNF-alpha and CRP) and an anti-inflammatory protein. With prolonged sleep deprivation, the body therefore loses its balance, and not in just one direction.

Sleep normally appears to keep the inflammatory balance in check through signalling substances of the immune system. When sleep is structurally lost, that balance is disrupted and a low-grade, chronic inflammation persists. Multiple review studies confirm this pattern, both in epidemiological population research and in controlled laboratory settings.

Over the longer term, chronic sleep deprivation has been linked in research to an increased risk of diseases in which inflammation plays a central role: cardiovascular disease, type 2 diabetes, brain diseases such as dementia, and certain forms of cancer. These are largely associations from population studies and laboratory work; whether sleep deprivation also actually causes these diseases in humans has not yet been fully proven. Researchers also point to methodological limitations in this type of research.

Indirectly, sleep deprivation also amplifies inflammation through other routes: glucose metabolism becomes dysregulated, the stress hormone cortisol rises, and the hormonal balance shifts. There is also a hypothesis that sleep deprivation puts the innate immune system into a kind of sustained state of heightened alertness, which may partly explain the chronic inflammation seen in cardiovascular disease. This idea is biologically plausible, but hard evidence in humans is not yet available.

In people with eczema, an additional complicating factor applies: the inflammation disrupts sleep through itching, and that sleep disruption in turn worsens the inflammation and the distribution of immune cells. A vicious cycle, then, although this is descriptive research without hard quantification.