NEW YORK–(BUSINESS WIRE)–According to travel search engine, half of Americans admit to having the “post-vacation blues.” Based on momondo’s third annual International Travel Survey of 1009 Americans ages 18-65, 49% of respondents feel “sad” or in “low spirits” after vacation. This is up from 39% via the same survey in 2015. Additional findings include: Women report feeling more down after a trip than men (52% vs. 45%) 60% of respondents say they bring home something from vacat