From this weekend's Sunday Times Magazine, the Body Section, on page 47:
Health Hacks - How to control your caffeine intake
1) Without a trace
Many foods contain a surprising amount of caffeine. Check nutritional info before buying so you can accurately chart your consumption.
2) Retain routine
The ritual of a morning coffee is often as powerful as the caffeine itself. Pick a substitute, such as green tea or decaffeinated coffee.
3) Just add water
Sip water with any caffeine you do drink. Water will dilute the psychoactive effects and simultaneously help you stay alert and awake.
4) Sleep well
Caffeine disrupts your sleep cycle and ability to wake up naturally. Get plenty of rest your body can adapt to a caffeine-free you.