During the day the brain changes in volume. To such conclusion scientists from Canada, analyzing MRI images 10 of thousands of volunteers who consented to the study.
The researchers compared the fraction of brain parenchyma of people in the morning and evening. It turned out the end of the day the size of the brain decreases, and in the morning again restored to the original volume.
This occurs due to redistribution of fluid in the body. At night due to the horizontal position of the body fluid is redistributed, so by morning the size of the brain more than in the evening.