[OC] Hidden breathing patterns revealed through amplitude analysis of sleep data

Data source: CPAP flow rate waveform (~25Hz sampling)

I analyzed overnight breathing waveform data (~25Hz sampling) to detect periodic breathing patterns.

The method:

• Extract individual breaths from the flow rate signal data harvested from CPAP device
• Identify inhale peaks and exhale valleys
• Construct smooth upper/lower amplitude envelopes
• Detect crescendo–decrescendo cycles characteristic of periodic breathing

The visualization shows:

• Raw breathing waveform (center)
• Envelope curves (top and bottom bounds)
• Highlighted region where a periodic pattern emerges

A sensitivity parameter controls how strictly patterns must match clinical definitions, allowing exploration of both clear and borderline cases.