premise: Cate arrived home from Sydney late last night totally exhausted . WYD week had been absolutely full on . She did enjoy herself , thought was more than happy to come home as she said she was sick of the crowds of people by the end of the week , wanted her own space again , and was pleased to be going back to school this morning for a rest lol . What may have caused Cate to arrive home exhausted ?
hypothesis: She finished travelling .