Crystal Math a.k.a. Crank

"It's time to get some sleep when:
  • You're out of crank
  • Your face is bouncing off the table
  • Your veins have completely disappeared beneath pasty goose flesh
  • Your shoes don't fit anymore
  • 24 simultaneous projects have stalled for lack of floor space suddenly
  • everyone is a cop
  • You've just set yourself on fire, again
  • You're nodding out...
    • into glassware
    • 15 minutes after shooting a 1/4g
    • at stoplights
    • in mid-sentence
    • in mid-shot
    • in mid-fuck"
(Speed Phreak)

Brilliant! My heydays are already over. I wish somebody would have told me this back in the days ;-) Kids: Don't even start.