one o'clock
Then you can leave me ; I shall sleep very comfortably . Come back and wake me a little before midnight . You will wake me easily by lifting my head and pressing one of my hands . Remember , if you should forget to wake me , and I should still be asleep at one o'clock , I should never open my eyes again , and should be dead before morning . Do as I tell you , for friendship 's sake , and when I wake I shall bathe and sleep naturally the rest of the night . '' I carefully fulfilled his instructions . Before I had finished rubbing his head he was drowsy , and when I took the vial from his nostrils he was sound asleep .