Or one person likes to get up at the crack of dawn to see as much as possible, while the other is a night owl who's never up before 10 AM. (bigtravelnut.com)
I also have two kids who naturally are different with their sleep preferences — my daughter is an early bird like me, and my son is a night owl like his dad. (ourfamilyworld.com)
She's always been a night owl and took a long time to wind down for sleep. (kateorson.com)