Oh, this really explains it all. I was wondering if this was only me who concentrates best just after lunch, with the second dose of extra-strong coffee, and with the rush to finish "everything planned for today" by 17h, before I am too tired, and before starting my "second life" (or life-after-work).

Ah, and this also resembles the weekly productivity curve : Monday, you answer urgent e-mails and quieries, Tuesday, the urgent e-mails and quieries get less (but your feeling to not advancing on your thesis/article gets higher), Wednesday and Thursday usually pass working hard, and Friday is a blogging and fooling around, preparing for the weekend day, after the feeling you did something (even if not enough) this week...

Life has simple explanations sometimes. Thanks Phd Commics