midnight
I had an idea worrying me . Besides , you see , in all this there are so many unnatural things , such queer coincidences and inconsistencies , that I dare not count on a certainty which the reality of to-morrow may destroy . '' They went on talking for some time , in a low voice , studying the question in all its bearings . At midnight they switched off the electric light in the chandelier and arranged that each should go to sleep in turn . And the hours went by as they had done when the two sat up before , with the same sounds of belated carriages and motor cars ; the same railway whistles ; the same silence . The night passed without alarm or incident of any kind . At daybreak the life out of doors was resumed ; and Don Luis , during his waking hours , had not heard a sound in the room except the monotonous snoring of his companion .