I work longer hours at home pretty often. At 5 I leave office to make sure my 1.25-1.5 hour drive gets me home at a decent time, and to make sure I miss the worst traffic which I feel happens between 5:30 and 6.

At home I can just keep working, load up a game on my other monitor but keep working open too,and switch between doing some minor game stuff and back to work. I have a game up now at 7 and wrapped up my notes quite comfortably.

I'm also more alert at home because I sleep in more, getting about an hour more sleep.