Some who day-drink do so because they keep odd hours or work third shifts, relegating their R&R to the hours when the sun is up. Some, however, do it purely for the love of the game. That’s the case for many of the old north-county dive bars, often patronized in the morning hours by older drinkers who’ve earned the right to call themselves pros. Charlack Pub (8334 Lackland Road, Overland; 314-423-8119) is no different — its regulars just wake up earlier. At 6 a.m. the scene is considerably more serene than at night, when the rock bands take the stage and the motorcycles fill the parking lot, but you’ll still have good company in the form of an old-timer or three who decided to start early. Learn from them, and one day you may have what it takes to become them. Charlack Pub is open from 6 a.m. to 1:30 a.m. Tuesday through Saturday and from 6 a.m. to 6 p.m. on Monday. The bar is closed on Sundays — even professionals need their day of rest.