38 hours.
I'm useless at this kinda game, I really am - I need my sleep and when I'm tired, I can sleep almost anywhere.
Those 38 hours are when I left the UK to hook up with my buddy in Germany, back in '93. It was terrible.
I spent a good 15 of those hours in various coach/bus/train stations.
It all culminated, on about the 34th hour, with me running into a clear reinforced glass door in a bar in Cologne, bruising my knees and splitting my lip in the process - that was after about 10 beers - I ran into the damn thing full tilt in the excitement of over-tiredness and being in Germany with my good buddy.
I did once have insomnia for about 2 months, but that doesn't really count - for pretty much the entire time, I slept about 3 hours a night. I started losing touch with reality at one point.
I've got a buddy who suffers from extreme insomnia and also drinks too much - he's totally whack. He can go 4 days without sleep, but you don't want to meet him when he's on a binge - scary stuff. Brilliant mind, but insane after his bouts with sleepless nights and days...