Poll: When does your productivity drop?

I think this poll is too one-dimensional. It embodies an implicit model of productivity (basically, "you are productive when you wake up and then you work steadily at a constant task of constant difficulty for N hours during which your productivity falls as some function of time") which isn't very realistic.

I definitely get tireder after 12 hours (not all of which are ever spent continuously working, so does that really count as "12"?) but does that make me less productive? It depends on what I am trying to do, and it is very dependent on context. If midnight is the only hour when you can focus, you may be relatively productive at midnight, especially if (e.g.) you're grinding through some less creative but tedious stuff that you can manage while a third of your brain is asleep.

If the secret to productivity was simply to divide the day evenly between sleeping and waking at the right ratio, maximizing productivity would be easy. Alas, it is not.