Lately, my coding productivity has been related to the time of day as well. I find myself doing more work in the evening or at night. Mainly because there's less disruptions (people) around to distract me online and offline. I could force myself back to doing more during the day, but it I would have to retrain myself since my brain is still in the mode of wanting to do other things at that point. Since the days are getting shorter here, I don't mind it so much, since I rather enjoy the Sunlight while it lasts.