Milan thinks this is an extremely sensible habit and he picks it up as well. (Having Kithabel to manage the paying-attention-to-time part of maintaining a sleep schedule is extremely beneficial and he would not be doing nearly so well at the biphasic thing if he didn't have the external cue, so following her shifting schedule would be a good idea even if it didn't also let him effectively spend zero time sleeping.)

...

With zero effective time spent sleeping, and a maximum mental capacity climbing steadily from seven times normal, it is not going to take him all that long until he can fly, is it. (Although becoming effortless master of all he surveys is still a frustratingly long way off.)