I fell asleep behind the wheel in 2005 (Didn't own the Z back then). Rumble strips in the central reservation woke me up, I pooped myself, looked at the speedo - 97mph - Oh crumbs, checked the rear view to see a strip of blue LED's flashing their arse off. Suffice to say I got a rollocking. They thought I was drunk so had the test, which was 0 (I don't really drink lol), fortunately.
Just got 3points & a £60 fine! I actually thanked them after, not only for their leniency, but also the fact they probably saved mine or someone else's life! Shockingly enough I don't take the risk to drive tired any more . . .