scholarly journals Sleep during an Antarctic summer expedition: new light on “polar insomnia”

2017 ◽  
Vol 122 (4) ◽  
pp. 788-794 ◽  
Author(s):  
Nathalie Pattyn ◽  
Olivier Mairesse ◽  
Aisha Cortoos ◽  
Nele Marcoen ◽  
Xavier Neyt ◽  
...  
Keyword(s):  
Slow Wave ◽  
Slow Wave Sleep ◽  
Well Being ◽  
Extreme Environment ◽  
Phase Delay ◽  
Continuous Illumination ◽  
Melatonin Secretion ◽  
Subjective Sleep Quality ◽  
Sleep Complaints ◽  
Psychomotor Vigilance

Sleep complaints are consistently cited as the most prominent health and well-being problem in Arctic and Antarctic expeditions, without clear evidence to identify the causal mechanisms. The present investigation aimed at studying sleep and determining circadian regulation and mood during a 4-mo Antarctic summer expedition. All data collection was performed during the continuous illumination of the Antarctic summer. After an habituation night and acclimatization to the environment (3 wk), ambulatory polysomnography (PSG) was performed in 21 healthy male subjects, free of medication. An 18-h profile (saliva sampling every 2 h) of cortisol and melatonin was assessed. Mood, sleepiness, and subjective sleep quality were assessed, and the psychomotor vigilance task was administered. PSG showed, in addition to high sleep fragmentation, a major decrease in slow-wave sleep (SWS) and an increase in stage R sleep. Furthermore, the ultradian rhythmicity of sleep was altered, with SWS occurring mainly at the end of the night and stage R sleep at the beginning. Cortisol secretion profiles were normal; melatonin secretion, however, showed a severe phase delay. There were no mood alterations according to the Profile of Mood States scores, but the psychomotor vigilance test showed an impaired vigilance performance. These results confirm previous reports on “polar insomnia”, the decrease in SWS, and present novel insight, the disturbed ultradian sleep structure. A hypothesis is formulated linking the prolonged SWS latency to the phase delay in melatonin. NEW & NOTEWORTHY The present paper presents a rare body of work on sleep and sleep wake regulation in the extreme environment of an Antarctic expedition, documenting the effects of constant illumination on sleep, mood, and chronobiology. For applied research, these results suggest the potential efficiency of melatonin supplementation in similar deployments. For fundamental research, these results warrant further investigation of the potential link between melatonin secretion and the onset of slow-wave sleep.

scholarly journals Exposure to relaxing words during sleep promotes slow-wave sleep and subjective sleep quality

2020 ◽  
Author(s):  
Jonas Beck ◽  
Erna Loretz ◽  
Björn Rasch
Keyword(s):  
Sleep Quality ◽  
Slow Wave ◽  
Slow Wave Sleep ◽  
Well Being ◽  
Subjective Sleep Quality ◽  
Sleep Depth ◽  
Activity Band ◽  
Underlying Mechanisms ◽  
Healthy Participants ◽  
Subjective Level

AbstractOur thoughts alter our sleep, but the underlying mechanisms are still unknown. We propose that mental processes are active to a greater or lesser extent during sleep and that this degree of activation affects our sleep depth. We examined this notion by activating the concept of “relaxation” during sleep using relaxation-related words in 50 healthy participants. In support of our hypothesis, playing relaxing words during non-rapid eye movement sleep extended the time spent in slow-wave sleep, increased power in the slow-wave activity band after the word cue, and abolished an asymmetrical sleep depth during the word presentation period. On the subjective level, participants reported a higher sleep quality and elevated alertness ratings. Our results support the notion that the activation of mental concepts during sleep can influence sleep depth and provide a basis for interventions using targeted activations to promote sleep depth and sleep quality to foster well-being and health.

scholarly journals Exposure to relaxing words during sleep promotes slow-wave sleep and subjective sleep quality

SLEEP ◽  
2021 ◽  
Author(s):  
Jonas Beck ◽  
Erna Loretz ◽  
Björn Rasch
Keyword(s):  
Sleep Quality ◽  
Slow Wave ◽  
Slow Wave Sleep ◽  
Well Being ◽  
Subjective Sleep Quality ◽  
Sleep Depth ◽  
Activity Band ◽  
Underlying Mechanisms ◽  
Subjective Alertness ◽  
Healthy Participants

Abstract Our thoughts alter our sleep, but the underlying mechanisms are still unknown. We propose that mental processes are active to a greater or lesser extent during sleep and that this degree of activation affects our sleep depth. We examined this notion by activating the concept of “relaxation” during sleep using relaxation-related words in 50 healthy participants. In support of our hypothesis, playing relaxing words during non-rapid eye movement sleep extended the time spent in slow-wave sleep, increased power in the slow-wave activity band after the word cue, and abolished an asymmetrical sleep depth during the word presentation period. In addition, participants reported a higher sleep quality and elevated subjective alertness. Our results support the notion that the activation of mental concepts during sleep can influence sleep depth. They provide a basis for interventions using targeted activations to promote sleep depth and sleep quality to foster well-being and health.

scholarly journals Improving night-time sleep with hypnotic suggestions

2018 ◽  
Author(s):  
Maren Jasmin Cordi ◽  
Laurent Rossier ◽  
Björn Rasch
Keyword(s):  
Sleep Quality ◽  
Slow Wave ◽  
Sleep Disturbances ◽  
Slow Wave Sleep ◽  
Well Being ◽  
Night Time ◽  
Subjective Sleep Quality ◽  
Age Related ◽  
Improve Sleep Quality ◽  
Hypnotic Suggestions

AbstractSlow-wave sleep (SWS) is fundamental for maintaining our health and well-being, and SWS is typically reduced in stress-related sleep disturbances and age-related sleep disorders. We have previously reported that exposure to hypnotic suggestions before sleep effectively increases the duration of SWS during a midday nap in younger and older women suggestible for hypnosis.However, it remains unclear whether this beneficial effect of hypnosis on SWS can be generalized to night-time sleep and men. Therefore, we tested the effect of the hypnotic suggestions on SWS across an 8 hours night-time sleeping interval in 43 healthy young French-speaking subjects (19 males) of high and low suggestibility. In accordance with our previous results, listening to hypnotic suggestions before sleep increased the amount of SWS in highly suggestible subjects significantly by 13 min compared to a control condition in both genders. Particularly in the first hour, slow-wave activity was significantly increased after hypnosis as compared to the control night in high suggestible. The hypnosis-induced benefits on objective sleep parameters were also reflected in increased subjective sleep quality ratings. Our results demonstrate that hypnotic suggestions are an effective tool to deepen sleep and improve sleep quality also across a whole night of sleep in young healthy men and women. Our findings provide an important basis for the examination and potential application of hypnosis to improve deep sleep in populations with sleep disturbances.

scholarly journals 0337 Effects of Slow Wave Sleep Augmentation on Subjective Sleep Quality

SLEEP ◽  
2018 ◽  
Vol 41 (suppl_1) ◽  
pp. A129-A129
Author(s):  
M L Lamphere ◽  
C S Robinson ◽  
N B Bryant ◽  
A P Jones ◽  
B Robert ◽  
...  
Keyword(s):  
Sleep Quality ◽  
Slow Wave ◽  
Slow Wave Sleep ◽  
Subjective Sleep Quality ◽  
Subjective Sleep

scholarly journals The Benefits of Closed-Loop Transcranial Alternating Current Stimulation on Subjective Sleep Quality

2018 ◽  
Vol 8 (12) ◽  
pp. 204 ◽  
Author(s):  
Charles Robinson ◽  
Natalie Bryant ◽  
Joshua Maxwell ◽  
Aaron Jones ◽  
Bradley Robert ◽  
...  
Keyword(s):  
Sleep Quality ◽  
Slow Wave ◽  
Closed Loop ◽  
Slow Wave Sleep ◽  
The United States ◽  
Alternating Current ◽  
Poor Sleep ◽  
Subjective Sleep Quality ◽  
Subjective Sleep ◽  
Transcranial Alternating Current Stimulation

Background: Poor sleep quality is a common complaint, affecting over one third of people in the United States. While sleep quality is thought to be related to slow-wave sleep (SWS), there has been little investigation to address whether modulating slow-wave oscillations (SWOs) that characterize SWS could impact sleep quality. Here we examined whether closed-loop transcranial alternating current stimulation (CL-tACS) applied during sleep impacts sleep quality and efficiency. Methods: CL-tACS was used in 21 participants delivered at the same frequency and in phase with endogenous SWOs during sleep. Sleep quality was assessed in the morning following either verum or sham control stimulation during sleep, with order counterbalanced within participants. Results: Higher sleep quality and efficiency were found after verum stimulation nights compared to control. The largest effects on sleep quality were found immediately following an adaptation night in the laboratory for which sleep quality was reduced. Conclusions: Applying CL-tACS at the same frequency and phase as endogenous SWOs may offer a novel method to improve subjective sleep quality after a night with poor quality sleep. CL-tACS might be helpful for increasing sleep quality and efficiency in otherwise healthy people, and in patients with clinical disorders that involve sleep deficits.

Selective slow-wave sleep suppression affects glucose tolerance and melatonin secretion. The role of sleep architecture

2020 ◽  
Vol 67 ◽  
pp. 171-183
Author(s):  
Yu.V. Ukraintseva ◽  
K.M. Liaukovich ◽  
K.A. Saltykov ◽  
D.A. Belov ◽  
А.N. Nizhnik
Keyword(s):  
Glucose Tolerance ◽  
Slow Wave ◽  
Slow Wave Sleep ◽  
Sleep Architecture ◽  
Melatonin Secretion

scholarly journals SELECTIVE SLOW-WAVE SLEEP SUPPRESSION AFFECTS WORKING MEMORY. THE ROLE OF MELATONIN SECRETION

2019 ◽  
Author(s):  
Yulia Ukraintseva ◽  
Krystsina Liaukovich ◽  
Konstantin Saltykov ◽  
Vladislav Antipov ◽  
Dmitriy Belov ◽  
...  
Keyword(s):  
Working Memory ◽  
Slow Wave ◽  
Slow Wave Sleep ◽  
Melatonin Secretion

scholarly journals 0352 A Large-Scale EEG Study at Home to Objectivise Effects of Ageing on Slow Wave Sleep and Process S

SLEEP ◽  
2020 ◽  
Vol 43 (Supplement_1) ◽  
pp. A133-A134
Author(s):  
K El Kanbi ◽  
V Thorey ◽  
L Artemis ◽  
A Chouraki ◽  
T Trichet ◽  
...  
Keyword(s):  
Slow Wave ◽  
Large Scale ◽  
Slow Wave Sleep ◽  
Large Population ◽  
Nrem Sleep ◽  
Slow Waves ◽  
High Signal ◽  
Eeg Signals ◽  
Sleep Complaints ◽  
Loop Procedure

Abstract Introduction Several studies have shown slow wave sleep (SWS) is altered with ageing. However, most of these studies have been conducted in-lab and usually over a single night. In this study, we assessed the evolution of process S with ageing by analysing the dynamics of endogenous and auditory-evoked slow waves in a large population. Methods 300 participants (200 M, 20 - 70 y.o.) were selected from volunteers users wearing a sleep headband for at least 3 nights, meeting the criteria of high signal quality and having no subjective sleep complaints nor being shift-workers. The Dreem headband is a connected device able to monitor EEG signals as well as pulse and movement and performs sleep staging in real-time automatically. Slow waves were detected as large negative deflections on the filtered EEG signals during NREM sleep. The auditory evoked slow waves were done using a previously validated closed-loop procedure. Results In our study, age was strongly correlated with N3 sleep duration (r=-0.34, p<0.0001), slow wave amplitude (r=-0.25, p<0.0001), and slow wave density (r=-0.40, p<0.0001). The slope of the slow wave activity, representing the process S here, was significantly decreased (r=-0.32, p<0.0001). This effect was mainly due to changes in the density of slow waves in the first 2 hours of sleep (r=-0.41, p<0.0001). Finally, our results show a decrease in the probability of auditory evoked slow waves (r=-0.43, p<0.0001). Conclusion These results confirmed the in-lab studies showing a heterogeneous alteration of homoeostatic process S with age, as well as a general decrease of slow wave occurrences, that is observed in parallel of a decrease of the probability of evoking slow waves, suggesting a global change in the system responsible for slow wave generation. Support This study was supported by Dreem sas and ANR, FLAG ERA 2015, HPB SLOW-Dyn

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