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All-night study/writing sessions should generally be avoided, but if you must stay up till dawn, Lifehacker links to some tips for getting the most out of a sleepless night.

Here's one from the Cranking Widgets blog on how to work effectively for 24 consecutive hours:

Map Out Objectives Before Starting Work - a very GTD-ish notion, but worth pointing out. If it?s 8:00pm and you know you?ll be watching the sunrise from your desk, it?s best to plot out exactly what needs to be done on a sheet of paper and check things off as you complete them. You don?t want to have to count on your barely-functioning brain to tell you what to do next, especially after you?ve been at it for several hours.