I was on a flight last night desperate for sleep after a few weeks of a few hours a night and no naps (boring story, too many personal details to relay here). I desperately wanted to sleep. The guy behind my was doing a single, extremely loud, harsh bark/cough every 9 or 10 minutes. I would just drift off and bam! Another cough. I was so tired that I would jolt awake. The adrenaline would subside, if drift into a liminal state, and bam. At the three hour mark I snagged a black coffee and got it into me as fast as I could. If I didn’t, I was pretty sure I was going to freak out.