40-ish hours. Stayed up working on a paper, went past the point of no return where I'd just have been more tired from sleeping for a few hours than just staying awake. Started nodding off at the afternoon lectures in the packed large lecture halls where there's never enough fresh air. Must've looked mildly undead. Tanked up on strongly brewed Persian Earl Grey. Resorted to pricking my arm with a mechnical pen to keep me alert.
Either that or the surreal first 45 hours of the Roskilde Festival trip. Left home at six, couldn't get any sleep in the ferry or bus due to inebriated Ålanders singing and playing guitar into the small hours of the night, arrived 5-ish in the morning, couldn't sleep in the morning once we'd set up camp, didn't help that the rain made a cacophonous noise on the tent. Once I crawled back into the sleeping bag at night I couldn't get any sleep until around 3 when the mad Dutch party bus stopped blasting us with crap music from sizeable roof-mounted speakers that were pointed directly at us and I no longer noticed the noisy diesel trains rumbling past every ten minutes.
I've found that the most relaxing sounds in the world, that knock me straight to sleep are:
-the sound of rain gently rattling on the roof and window.
-someone next to you, breathing, fast asleep.
- when camping: soft muted voices from tents or around campfires, tents gently rustling, banners flapping.
If it breaks, you get to keep both pieces.