In a nod to Apple's attention to detail and human engineering, Flood Light describes how Apple got its sleep status indicator right, while Dell got it wrong. A July 2002 patent for a Breathing Status LED Indicator describes how the blink rate of a sleep status LED would be timed to a slow breathing rhythm. The blink rate of current Mac notebooks falls within the average respiratory rate of an adult -- between 12-20 breaths per minute. For example, the blink rate of the MacBook Pro 15in late 2008 is exactly 12 cycles per minute.
