I use to believe this bs. I thought people who took vacations were slackers and people who left the office before I did were lazy. In 2014 I started cutting my medication (bipolar 1 disorder) in half so I could sleep less and work more. Long story short, ended up back-firing leading to a 9 month leave of absence. In the end it was the best thing that ever happened to me. Working smart is the way to go IMO.