midnight
You have but to observe four rules . First , to tell no living soul of your resolve during the month of initiation . Second , to keep your vigil always between the two great beeches in the middle of the Ring . Third , to issue forth at midnight and immerse your head in the Dewpond which lies on the hilltop to the west , and having done so to return to your watch between the trees . And fourth , to make no utterance on any account whatever from sunset to sunrise . '' `` Suppose I should sneeze ? '' inquired the King anxiously .