scholarly journals Sleep syncope: a new clinical entity or just a vasovagal syncope during wakefulness after sleep onset?

2022 ◽  
Author(s):  
Philippe T. Gilchrist ◽  
Federica Provini
Keyword(s):  
Vasovagal Syncope ◽  
Sleep Onset ◽  
Clinical Entity

Spectral and Topographic Microstructure of Brain Alpha Activity During Drowsiness at Sleep Onset and REM Sleep

2000 ◽  
Vol 14 (3) ◽  
pp. 151-158 ◽  
Author(s):  
José Luis Cantero ◽  
Mercedes Atienza
Keyword(s):  
Rem Sleep ◽  
Spectral Component ◽  
Sleep Onset ◽  
Quantitative Information ◽  
Maximum Energy ◽  
Alpha Activity ◽  
The Other ◽  
Classification Algorithms ◽  
Microstructural Properties ◽  
Brain States

Abstract High-resolution frequency methods were used to describe the spectral and topographic microstructure of human spontaneous alpha activity in the drowsiness (DR) period at sleep onset and during REM sleep. Electroencephalographic (EEG), electrooculographic (EOG), and electromyographic (EMG) measurements were obtained during sleep in 10 healthy volunteer subjects. Spectral microstructure of alpha activity during DR showed a significant maximum power with respect to REM-alpha bursts for the components in the 9.7-10.9 Hz range, whereas REM-alpha bursts reached their maximum statistical differentiation from the sleep onset alpha activity at the components between 7.8 and 8.6 Hz. Furthermore, the maximum energy over occipital regions appeared in a different spectral component in each brain activation state, namely, 10.1 Hz in drowsiness and 8.6 Hz in REM sleep. These results provide quantitative information for differentiating the drowsiness alpha activity and REM-alpha by studying their microstructural properties. On the other hand, these data suggest that the spectral microstructure of alpha activity during sleep onset and REM sleep could be a useful index to implement in automatic classification algorithms in order to improve the differentiation between the two brain states.

Ungewöhnliche attackenweise Einschlafstörungen Unusual attack-like sleep onset disturbances

2017 ◽  
Vol 36 (06) ◽  
pp. 435-438
Author(s):  
M. Sparmann ◽  
D. Müller
Keyword(s):  
Sleep Onset ◽  
Sleep Starts

ZusammenfassungUnter Bezugnahme auf einen Fallbericht mit stromstoßartigen Empfindungen im Rachen beim Einschlafen sowie Zusammenzucken infolge Erschreckens dabei und unabhängig davon Zuckungen der Arme oder Beine sowie Apnoen wird auf das Vorkommen von sensiblen oder sensorischen Wahrnehmungen als ungewöhnliche Begleiterscheinungen von Einschlafmyoklonien hingewiesen. Sie können auch ohne Zuckungen als deren Äquivalente bzw. Varianten auftreten und werden sensory sleep starts genannt. Bislang hat das Gefühl des explodierenden Kopfes besondere Beachtung gefunden und ist in der internationalen Klassifikation der Schlafstörungen als exploding head syndrome neben den Halluzinationen angeführt, obgleich es zu diesen gehört.

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