Pies: Dogs do dream

Evidence: 73 • authority: 88

The relationship between frequency of rapid eye movements in REM sleep and SWS rebound. Previous studies have shown a decrease in rapid eye movement (REM) frequency during desynchronized sleep in recovery nights following total or partial sleep deprivation. This effect has been ascribed to an increase in sleep need or sleep depth consequent to sleep length manipulations. The aims of this study were to assess REM frequency variations in the recovery night after two consecutive nights of selective slow‐wave sleep (SWS) deprivation, and to evaluate the relationships between REM frequency and SWS amount and auditory arousal thresholds (AAT), as an independent index of sleep depth. Ten normal ma…

Evidence: 59 • authority: 72

Evidence: 58 • authority: 88

Rapid eye movement (REM)‐related obstructive sleep apnea and hypertension: insights from the clinical spectrum of apnea–hypopnea index ratios across REM and non‐REM sleep stages in a Chinese cohort. Summary Previous studies have linked sleep‐disordered breathing during rapid eye movement (REM) sleep to hypertension. However, no standardised definition of REM‐related obstructive sleep apnea (REM‐OSA) exists. This study aimed to evaluate whether the ratio of the apnea–hypopnea index (AHI) in REM to that in non‐REM (NREM) (REM‐AHI/NREM‐AHI) accurately identifies patients with OSA comorbid with hypertension. We screened 1439 participants and included 790 patients with OSA. REM‐OSA was defined a…

Evidence: 54 • authority: 72

Evidence: 52 • authority: 92

Evidence: 47 • authority: 80

Experimental studies on memory during slow sleep stages and REM stages

Evidence: 47 • authority: 92

5-MeO-DMT induces sleep-like LFP spectral signatures in the hippocampus and prefrontal cortex of awake rats.. 5-methoxy-N,N-dimethyltryptamine (5-MeO-DMT) is a potent classical psychedelic known to induce changes in locomotion, behaviour, and sleep in rodents. However, there is limited knowledge regarding its acute neurophysiological effects. Local field potentials (LFPs) are commonly used as a proxy for neural activity, but previous studies investigating psychedelics have been hindered by confounding effects of behavioural changes and anaesthesia, which alter these signals. To address this gap, we investigated acute LFP changes in the hippocampus (HP) and medial prefrontal cortex (mPFC) of…

Evidence: 45 • authority: 92

Evidence: 45 • authority: 92

Evidence: 43 • authority: 92

Evidence: 41 • authority: 92

An afternoon nap facilitates analogical transfer in creative problem solving.. In analogical problem solving, the solution to a previously experienced problem (source) is used to solve a new but structurally similar problem (target). Yet, analogical transfer is seldom successful, as structural commonalities between source and target problems can be difficult to recognise. Theoretically, memory consolidation processes during REM sleep may help to identify and strengthen connections between weakly related memories, improving the ability to use analogical transfer. In the current experiment, participants attempted to solve source problems, were told the solutions, and then attempted to solve n…

Evidence: 38 • authority: 80