Just when you thought you had the baby burrito mastered, the swaddle unravels — once and for all.Good-bye, wrap. Hello, sleep sack.Make the transition to swaddle-free sleeping as easy as Sunday morning (before kids) with the latest from Aden + Anais. The beloved swaddle maker fashioned its famous cotton muslin into crib sheets.Just like the company’s all-purpose blankets, the muslin bedding gets softer every time it’s washed. Elastic edging makes for a secure fit over the mattress, and a wide weave allows air to circulate, helping regulate baby’s temperature and keep him safe.The sheets come in soft, solid colors (gray, pink, blue) and delicate patterns (owls, stars, dogs) that lull even the youngest resters into a deep sleep.Just like a burrito but without the indigestion.Available online at adenandanais.com, $30-$40.Photo: Courtesy of Aden + Anais EATOff the Grid: Friday Night Food Truck PartyWhat: Take to the streets for a family feast with two dozen food trucks to choose from.Why: Live music makes it feel like date night.When: Thru Oct. Fri., 5-10 p.m.Where: Fort Mason Center, 99 Marina Blvd., at Buchanan St. (415-345-7500).PICTUREKarl Johnson’s Cut Arts SilhouettesWhat: The freehand master of the silhouette returns to the Bay area.Why: Just in time for Mother’s Day.When: Thurs., 11 a.m.-5 p.m. Appt. required.Where: Mr. Mopps’, 1405 Martin Luther King Jr. Way, Berkeley (510-525-9633).SEELittle Opera’s Creatures of the NightWhat: Kids ages 6-10 perform the culmination of a yearlong program in which they learn to create, write, and perform an original opera.Why: Sing it, kids, sing it.When: Tues., 4:30 p.m.; Thurs., 7 p.m.Where: The Alcove Theatre, 414 Mason St., 5th flr. For info, call 831-295-9788. Tickets online at artfullyhq.com. General admission, $15-$25; children, free.