Researchers have investigated whether the body is truly disconnected from the external world during sleep. To do so, they focused on how heartbeat changes when we hear different words during sleep.

A new study reveals that while we sleep, our brains quietly sort through the day’s experiences, keeping what we intend to remember and letting emotion-driven moments drift away. Study: Top-down ...

They found that relaxing words slowed down cardiac activity as a reflection of deeper sleep and in comparison to neutral words that did not have such a slowing effect. This discovery is presented in ...

A discovery by researchers from the GIGA - Center of Research Cyclotron at University of Liège reveals that the sleeping body also reacts to the external world during sleep, explaining how some ...