If you spend less than 48 hours at destination, try to keep your internal clock at the time of your point of origin. Otherwise you'll probably waste your time and energy TWICE !
If you really have to adjust to local time, eat at the same time as the "locals", and stay outside (go walking) during daylight hours. Take coffee or tea for breakfast and lunch but avoid them for diner. Take a warm shower before going to sleep and a cold one after wake-up (brrr).