Good advice from the guys. I'll only add this: There is always the potential for problems with any smoker left unattended for hours at a time...the wood burns up, the temp spikes and burns up your meat, the flame could go out...you get the idea. Regardless of what kind of smoker it is, they need to be checked on occasionally...to monitor cook temps, add fuel/wood, check internal meat temps, etc. I just shake my head when I read posts from guys who went to bed and slept through the night, only to wake up the next morning to find a dead smoker and a raw, ruined hunk of meat...or they had a temp spike in the night and their meat is now a piece of charcoal.
I never go to bed and sleep through the night on overnight cooks. I like to check on things at least once an hour. If I need sleep, I'll lie down for an hour or so with an alarm set to get me up so I can go check on my smoker.
Just me 2 cents...I'm sure some of the guys trust their rigs enough to go to bed and forget it...I'm just a little too OCD to do that.