Take a photo of a barcode or cover
A review by jewellspring
The Power of When: Discover Your Chronotype--And the Best Time to Eat Lunch, Ask for a Raise, Have Sex, Write a Novel, Take Your Meds, an by Michael Breus
3.0
Not crazy about it (I'm a dolphin...I think? The dolphin's schedule was WAY too complicated), but helpful for principles.