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| ANSI Common Lisp 25 Environment 25.2 Dictionary of Environment
25.2.4 sleep | Function
  Syntax: sleep seconds nil Arguments and Values: seconds - a non-negative real. Description: Causes execution to cease and become dormant for approximately the seconds of real time indicated by seconds, whereupon execution is resumed. Examples:
       (sleep 1)   NIL

      ;; Actually, since SLEEP is permitted to use approximate timing,
      ;; this might not always yield true, but it will often enough that
      ;; we felt it to be a productive example of the intent.
       (let ((then (get-universal-time))
             (now  (progn (sleep 10) (get-universal-time))))
         (>= (- now then) 10))
       true
Side Effects: Causes processing to pause. Affected By: The granularity of the scheduler. Exceptional Situations: Should signal an error of type type-error if seconds is not a non-negative real. Allegro CL Implementation Details: None.

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