At times like this I'm thankful that my current employer is on the flextime wagon. I still have my alloted time per week (mostly more than that, but well...), y

At times like this I'm thankful that my current employer is on the flextime wagon. I still have my alloted time per week (mostly more than that, but well...), yet it doesn't really matter that much when I take it. So I don't have to fit my natural rhythm around my work schedule. Talking to your employer might be a decent alternative to this. It has the added benefit that in the evening the office is pretty empty -- and that's when I usually get more productive. For people who have their highest productivity in the morning, being the first in the office would be better, though.