Translations:E2/37/en
From Polyphasic Sleep Wiki
The pronap has been applied in a lot of E2 variants and has reported some success. The pronap is a longer nap around REM peak, usually between 30 to 45 minutes, which allows more REM sleep. This may help people with higher REM requirements to adapt. The longer nap may also allow a longer wake gap after it (possibly up to 8h) if there is no chance to nap around noon or early afternoon. However, so far the success rate with the long wake gap is still not high, even with the pronap. Thus, it is recommended to still limit the gap to about 7 hours.
