Taking their name from a priceless quote from "The Simpsons" elementary-school idiot Ralph Wiggum ("Oh boy, sleep! That's where I'm a Viking!"), Florida six-piece Sleepy Viking has generated healthy buzz after delivering a number of head-turning performances at music festivals such as North by Northeast, South by Southwest and the College Music Journal Music Marathon. Centering its sound on jangly, shoe-gazing guitar work and the feminine coo of lead vocalist Tessa McKenna, the band swells with sonic texture and hazy hooks. Sleepy Viking tours behind its recently released debut LP, "They Will Find You Here," at Sprout on Monday, June 13, at 8 p.m. Free. 592-5771.