How literal is this phrase?

Sample examples at http://tinyurl.com/is-it-lit

graveyard watch:

Definitions:

  1. a watch during the night (as from midnight to 8 a.m.)

Examples:

  1. ] Worst watch was-- & is--the 12 - 4 . Universally known as the " graveyard watch " , it involved being woken at midnight after only 5 hours sleep , missing
  2. accidents in show biz then down the back stage tunnel to the bedsit under the graveyard watch . a tunnel channel taken by the many emprisoned by imperatives & short-rent money .

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Step 3: score of 0-5 for how literal is the phrase "graveyard watch"
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