[taloft]

All good points. Note that caffeine has a half life of 5 to 6 hours, rather than 12. I’d cite it, but a simple search makes this apparent.

[LinuxBender]

Thankyou for the correction. I am probably mis-remembering from a talk that Dr. Matthiew Walker gave at Google about sleep. I will need to figure out where I got the 12 hours from.