Nguyen is returning to New York from a long trip to Southeast Asia. When he arrives, he feels like he could sleep for a week, has trouble remembering where he parked his car, then drops his keys when he finally finds it. Nguyen is suffering from "jet lag," a type of that occurs when people travel quickly across several time zones.

Persons who have not yet attained the legal age of consent under the applicable laws in the jurisdiction in which the research was approved.persons who are under 18 years of age.persons who have not yet attained the legal age of consent under the applicable laws in the jurisdiction in which the research will be conducted.persons who are under 21 years of age.