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Figure 1: Example of an EEG arousal according to definitions of the American Academy of Sleep Medicine.[6,20] An increase in EMG amplitude (with corresponding artifacts in the EEG) and an increase in EEG frequency are the defining elements of the EEG arousal. The EEG arousal is accompanied by a vegetative arousal (i.e., an increase in heart rate seen in the ECG channel). 36 s are printed in this record, and therefore the arousal lasts for approximately 12 s, which does not qualify the epoch to be scored as wake.[6,7] EEG: Electroencephalogram; EMG: Electromyogram; ECG: Electrocardiogram

Figure 1: Example of an EEG arousal according to definitions of the American Academy of Sleep Medicine.[6,20] An increase in EMG amplitude (with corresponding artifacts in the EEG) and an increase in EEG frequency are the defining elements of the EEG arousal. The EEG arousal is accompanied by a vegetative arousal (i.e., an increase in heart rate seen in the ECG channel). 36 s are printed in this record, and therefore the arousal lasts for approximately 12 s, which does not qualify the epoch to be scored as wake.<sup>[6,7]</sup> EEG: Electroencephalogram; EMG: Electromyogram; ECG: Electrocardiogram