Takeaway
A non-pharmacological intervention that involves a presentation of relaxing words during sleep can extend sleep depth and improve sleep quality.
Why this matters
The amount of deep sleep or slow-wave sleep (SWS), which is important for both physical and mental health, can be modulated by neurophysiological and cognitive processes.
In this study, the researchers shed light on the effect of cognitive processes on SWS and provide evidence to guide future non-pharmacological interventions targeted at promoting sleep depth and quality.