How do you know when the baby has slept well????? That is how! Just look at the hair and the degree to which it is sticking up off the head, is how well they slept. This also works if it is really sweaty and matted to their heads, they slept well then also. If there are is very little messy hair or sheet wrinkles on their cheeks, it is early to bed the next night. I had to include Jake all dapper and ready for church. His hair did lay down with enough water and gel, and egg whites. : )