Onar, or oneiric sonar, is a hack for plumbing your unconscious mind in search of new ideas during hypnagogic sleep. It's similar to methods used by Salvador Dali and Thomas Edison.
Concrete ideas to modify and expand this hack go here.
Freeform discussion of this hack goes here.
Errata go here.
This is a page for a hack from the book MindPerformanceHacks by Ron Hale-Evans.