Increased deep sleep benefits your heart.

Increased deep sleep has been found to have significant benefits for the cardiovascular system, according to research by ETH Zurich and the University of Zurich. During deep sleep, the heart’s left ventricle contracts and relaxes more vigorously when stimulated with brief tones. This action increases blood flow, benefiting the cardiovascular system by supplying organs, extremities, and the brain with oxygen-rich blood. The study, involving 18 healthy men, revealed improved cardiac function after just one night of stimulation, showing the potential impact of deep sleep on heart health.