European babes have been snoozing in these things for years, but they're a relatively new idea for naptime over here. The Angel's Nest is really just a sleeping bag for tots, but there's some deep-sleep thinking behind the concept. The bags are safer and more reliable than tangly, loose bedding, and they're soft as a cloud and impossible to shake off. Denverite Jennifer Zinn so loved one sent to her by a sister in France that she hatched a plan to market her own, in two styles. Through her website, Zinn offers a standard "sleeping bag," for babies still sleeping exclusively on their backs, and a "wearable bag" -- sort of a closed romper with no legs for little ones old enough to roll around. The Nests come in a variety of cushy materials and seasonal weights. Rock-a-bye, baby.