Why the Dreaming Phase Matters

Summary: REM sleep significantly increases the flow of red blood cells through the brain’s capillaries.

Source: University of Tsukuba

Scientists have long wondered why almost all animals sleep, despite the disadvantages to survival of being unconscious. Now, researchers led by a team from the University of Tsukuba have found new evidence of brain refreshing that takes place during a specific phase of sleep: rapid eye movement (REM) sleep, which is when you tend to dream a lot.

Previous studies have measured differences in blood flow in the brain between REM sleep, non-REM sleep, and wakefulness using various methods, with conflicting results. In their latest work, the Tsukuba-led team used a technique to directly visualize the movement of red blood cells in the brain capillaries (where nutrients and waste products are exchanged between brain cells and blood) of mice during awake and asleep states.

“We used a dye to make the brain blood vessels visible under fluorescent light, using a technique known as two-photon microscopy,” says senior author of the study Professor Yu Hayashi. “In this way, we could directly observe the red blood cells in capillaries of the neocortex in non-anesthetized mice.”

The researchers also measured electrical activity in the brain to identify REM sleep, non-REM sleep, and wakefulness, and looked for differences in blood flow between these phases.

“We were surprised by the results,” explains Professor Hayashi. “There was a massive flow of red blood cells through the brain capillaries during REM sleep, but no difference between non-REM sleep and the awake state, showing that REM sleep is a unique state”

The research team then disrupted the mice’s sleep, resulting in “rebound” REM sleep—a stronger form of REM sleep to compensate for the earlier disruption. Blood flow in the brain was further increased during rebound REM sleep, suggesting an association between blood flow and REM sleep strength.

This shows a little girl sleeping with her teddy bear
Blood flow in the brain was further increased during rebound REM sleep, suggesting an association between blood flow and REM sleep strength. Image is in the public domain

However, when the researchers repeated the same experiments in mice without adenosine A2a receptors (the receptors whose blockade makes you feel more awake after drinking coffee), there was less of an increase in blood flow during REM sleep, even during rebound REM sleep.

“These results suggest that adenosine A2a receptors may be responsible for at least some of the changes in blood flow in the brain during REM sleep,” says Professor Hayashi.

Given that reduced blood flow in the brain and decreased REM sleep are correlated with the development of Alzheimer’s disease, which involves the buildup of waste products in the brain, it may be interesting to address whether increased blood flow in the brain capillaries during REM sleep is important for waste removal from the brain.

This study lays preliminary groundwork for future investigations into the role of adenosine A2a receptors in this process, which could ultimately lead to the development of new treatments for conditions such as Alzheimer’s disease.

About this sleep and neuroscience research news

Author: Press Office
Source: University of Tsukuba
Contact: Press Office – University of Tsukuba
Image: The image is in the public domain

Original Research: Open access.
Cerebral capillary blood flow upsurge during REM sleep is mediated by A2a receptors” by Chia-Jung Tsai et al. Cell Reports


Cerebral capillary blood flow upsurge during REM sleep is mediated by A2a receptors


  • A method to directly measure capillary CBF across sleep/wake is developed
  • Capillary CBF is highest during REM sleep
  • Capillary CBF is comparable between active wakefulness and non-REM sleep
  • A2aR signaling is crucial for the CBF upsurge during REM sleep


Sleep is generally viewed as a period of recovery, but how the supply of cerebral blood flow (CBF) changes across sleep/wake states has remained unclear.

Here, we directly observe red blood cells (RBCs) within capillaries, where the actual substance exchange between the blood and neurons/glia occurs, by two-photon microscopy.

Across multiple cortical areas, average capillary CBF is largely increased during rapid eye movement (REM) sleep, whereas it does not differ between periods of active wakefulness and non-REM sleep. Capillary RBC flow during REM sleep is further elevated following REM sleep deprivation, suggesting that capillary CBF reflects REM sleep pressure.

At the molecular level, signaling via adenosine A2a receptors is crucial; in A2a-KO mice, capillary CBF upsurge during REM sleep is dampened, and effects of REM sleep pressure are abolished.

These results provide evidence regarding the dynamics of capillary CBF across sleep/wake states and insights to the underlying mechanisms.

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