METHOD NOTES / Facial expression analysis

Make facial movements observable.

What else can we observe when someone says they feel sleepy?

Method illustration, not measured results

What it records

Facial analysis turns movements in video into comparable records. Here, eyelid and eye-closure movements provide clues before sleep; they do not independently reveal someone’s feelings.

Its role in this study

Locate eyelid-related facial movements in the pre-sleep observation period, alongside self-reports. The question is which changes deserve interpretation, rather than assigning an emotion to a face.

Before interpreting

Detecting movements and interpreting emotions are separate steps. Lighting, angles, occlusion and analysis conditions matter. A movement alone does not establish sleepiness or product efficacy.

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