I've been tracking my sleep with a wearable for the past year, and the data shows I average only five hours and forty minutes a night, even though I feel fine most days. My doctor keeps telling me I need seven to nine hours, but I can't seem to hit that without feeling groggy. Is the universal sleep guideline actually backed by solid science, or is it just a blanket rule that ignores individual variation? I'm starting to wonder if we've been misled by broad population studies that don't account for genetic differences in sleep needs.