Sleep function in Oralce PL / SQL

The following small function attempts to obtain a system resource, eg if an index should be created on a "busy" table. You wait a while and tried until the counter has reached the maximum.
CREATE OR REPLACE PROCEDURE Sleep_function IS
  GotIt  BOOLEAN := FALSE;
  Count  NUMBER  := 0;
BEGIN
  WHILE (NOT GotIt AND NOT (Count > 10)) LOOP
    BEGIN
      -- Try to get free slot, if OK, set GotIt = TRUE
      -- else EXCEPTION will automatically fire.
      (Insert Code here)
      GotIt := TRUE;
    EXCEPTION
      WHEN OTHERS THEN
        GotIt := FALSE;
        DBMS_LOCK.SLEEP(10);
        Count := Count + 1;
    END;
  END LOOP;
END;
/