For something so simple (even babies do it), sleep isn't such an easy thing to master. (greatist.com)
Putting a baby to bed seems like such an easy thing for someone who's never had a child, but moms and dads know it can be pretty tough stuff. (babygaga.com)
Though many bookstores have small indie sections or may want to carry more indie titles, it is not always such an easy thing to do. (indieexcellence.com)