What does the calculation method use to establish a target bedtime by working backward from a 6:30 a.m. wake-up for an 8-hour requirement?
Answer
Simple subtraction resulting in 10:30 p.m. (before cycle adjustment)
The foundational method for calculating a target bedtime involves simple subtraction from the fixed wake-up time based on the required sleep duration. For an adult needing 8 hours of sleep and aiming to wake at 6:30 a.m., subtracting 8 hours directly from the wake time yields a straightforward target sleep time of 10:30 p.m. This simple subtraction provides the raw duration needed. The text further refines this by suggesting a Cycle-Adjusted Target, which subtracts an additional 15-minute buffer (to account for sleep latency) resulting in 10:15 p.m., but the basic subtraction of 8 hours from 6:30 a.m. establishes the initial calculation point.
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