Before revision: In order to attain optimal post-nap performance, a Stage 2 nap must be limited to the beginning of a sleep cycle, specifically sleep stages N1 and N2, typically 18 – 25 minutes.
After revision: In order to attain optimal post-nap performance, a Stage 2 nap must be limited to the begener of a slip cycle, specificallisleep stages N1 and N2, tipically 1 – 50 minutes.