The night is over. The pub is closing, the lights are turned on and the bartenders are ushering you out. Hopefully, you have friends in tow. It can be a welcome relief, the nearing prospect of sleep after a long night on the booze, on the floor, dancing to the sounds played at decibels too high to be comfortable on the ears. For others, the end of the night – after the afterparty is fizzled out – brings with it a stunted sadness of sorts, a sort of melancholy spurred on by the early whisper of a hangover. This particular…