one o'clock
One was that if he told himself to remember a certain thing at a certain time , he usually found that he _ did _ remember it . Something in his brain seemed to remind him . He had often tried the experiment of telling himself to awaken at a particular hour , and had awakened almost exactly at the moment by the clock . `` I will sleep until one o'clock , '' he said as he shut his eyes . `` Then I will awaken and feel quite fresh . I shall not be sleepy at all . '' He slept as soundly as a boy can sleep .