Now, when exactly was it that I went up yesterday...? (or rather two days ago, now that midnight has passed) Definitely not earlier than 15:00, nor later than 18:00. Even in the latter case, I have now been up beyond 30 hours. Concidering that I must be up at ~8 in the morning, sleeping now would no doubt leave my mind somewhat hosed upon awakening and dragging myself out of bed. Waiting a few more hours would make it much more so. Not sleeping at all could easily last me until lunch, after which I can go home to sleep.