I'm usually immune to the effects of caffeine but I may have overdone it today. 2 cups of machine-brew for breakfast, 1 hand-poured teh tarik at lunch (the mutton byriani was fabulous at this run-down looking coffee-shop on Hill Street, BTW) and immediately followed by a large brewed Nescafe 'cos NBS and I were early for class and wanted to kill time without wandering aimlessly downtown like lost souls. Result: a small headache while Mark continued lecturing on logic and argument construction.

Later, I discovered caffeine crash: a state of extreme drowsiness once the stay-awake effect has worn off. zzz...