"A recent study in hamsters showed that sildenafil aided in a 50% faster recovery from shifts comparable to eastward travel experienced by humans and was effective starting at low doses. However, this use has not been tested in humans and is considered an off-label use by the drug's manufacturers.The presence of low-level light at night also accelerates recovery rate in both east- and west-travelling hamsters of all ages by 50%; this is thought to be related to simulation of moonlight"

Aww. East travelling and west travelling hamsters and their little hamster wheels.