A state of sleep different to REM sleep that reduces the basal selyn-consumption rate.
(Source: Index card file. House of Zeor) Sime ability or state, not true sleep reduces the basal selyn-consumption rate --- can put off Need for a few hours. Not safe to practice in the cold --- if a Sime goes too deep, might never wake. Goes to "sleep" instantly. High-field, Hugh could wake Klyd up by "intimate contact." Klyd goes into menar sleep while he and Hugh shelter in cave in their flight from the Runzi.