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. 2024 Sep 16;10:176. doi: 10.1038/s41531-024-00765-4

Fig. 2. Examples of sighs during NREM and REM sleep.

Fig. 2

Sighs in NREM N3 stage without (A, participant with PD) and with (B, participant with MSA) post-sigh central apnea. Sighs in REM sleep without (C, participant with MSA) and with (D, participant with MSA) post sigh central apnea, in a 5-min long epoch. Y axis: From the top to the bottom, SpO2: Oxyhemoglobin saturation; Therm: naso-oral thermistor; Flow: nasal pressure; Tho: thoracic movements; Abd: abdomen movements; Pulse: heart rate; Pleth: pulse wave.