I need a vacation to regain/recover my 'sanity'. [=to begin to feel normal and relaxed again]
She is the mother of six children but somehow keeps her 'sanity'.
The 'sanity' of the decision was never in question.
(..) Twenty-year-old kid. billion dollar company. What was dad thinking? I mean you're all lawyers...right? Surely someone must have questioned his sanity in the end. Someone must have thought about having him declared legally incompetent. would have made this conversation a lot easier. - Harry... (..)2014 The Amazing Spider-Man 2