One Reason Westward Travel Is Less Disruptive of the Circadian

Multiple Choice

One reason westward travel is less disruptive of the circadian than eastward travel is that it is easier to ___ than to ___.

A) go to sleep later,go to sleep when you are not sleepy
B) go to sleep early,go to sleep later
C) sleep during the day,stay awake when it's dark
D) go to sleep early,go to sleep when you are used to