For her New Year’s resolution, Cheryl Tan decided that she would drink less alcohol on nights out. The 26-year-old Singaporean finance professional said she was starting to find it increasingly difficult to shed the effects of hangovers, rendering her immobile long into the next day. “It seemed like recovery after a night out was taking too long, and I started to scale back so I would be more productive,” she said. Cutting back has also saved her money. A cocktail at a speakeasy in Singapore...