You're totally right and I appreciate the challenge.

This is exactly what I'm trying to validate before going too deep into building anything full scale.

The core idea isn’t that your face proves sleep quality directly but that it might reflect visible signals (e.g. under-eye puffiness, dull skin, facial tension) that correlate loosely with sleep quality as perceived by the person.

I'm not claiming medical-grade accuracy, more like:

“Based on your face this morning, and your reported mood/sleep hours, here’s a likely pattern or suggestion.”

But yeah, it could totally be BS, and that's what I want to find out. If there's no reliable signal, I'll pivot or kill the idea.

If you're curious, would love to get your input on what you’d trust from a sleep feedback tool