Figure 2

Polygraphic recording of nonREM sleep stage 4 (20-s epoch). Electroencephalogram (EEG; derivation C3-A2), electromyogram (EMG), electrocardiogram (EKG). The two respiration signals indicate flow (blue) and effort (green). The position of the epoch within the night is indicated by the first pink vertical line in Figure 4.

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published 2000