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A, profound hypoventilation caused by bilateral Arch activation (10 s; grey rectangles) in one rat at 65% 
in non-REM sleep. Despite this sudden hypoventilation, the animal does not arouse from non-REM sleep (EEG delta wave activity: 0.5–4 Hz). Traces correspond to the four examples shown in Supplemental videos 1–2. B, enlarged traces of trials 1 and 4.
