If you want to get more sleep, there is no harm in cooking at 275-325 F. And remember, a butt isn't done till the bone wiggles and almost falls out. Don't cook it by temperature or time. Many people around here can get a butt perfectly cooked in less than 8 hours with proper application of heat.
+2 on not soaking wood chunks. All that does is make your fire burn dirty. Just bury a few chunks in your pile of lump before lighting, so they gradually burn up during the cook.
Modded Brinkmann Gourmet. Basic UDS. Rescued 22.5" OTS. SJS Mini-WSM. Stubbs. B&B Oak Lump.
Cannondale 2009 F8 (for burning off all the great BBQ)