n. a movement toward something without effort; easy advancement; an easy task. (Something that could be done in one's sleep. See also cakewalk; walk.) : Getting the degree was a sleepwalk. Getting a job was hell.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw-Hill Education.
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When people sleepwalk, they may sit up and look as though they are awake when they are actually asleep.