Our understanding of the melatonin cycle strongly suggests melatonin taken first thing upon waking up would work for this, but as far as I know this has never been formally investigated. The best I can find is researchers saying that they think it would happen and being confused why no other researcher has investigated this.
I once accidentally took 0.3mg melatonin around 9:00am in the morning, and the subsequent few days felt almost exactly like my experience of recovering from quite bad jetlag after returning from a timezone 5-6 hours earlier than mine.
Anecdata on:
I once accidentally took 0.3mg melatonin around 9:00am in the morning, and the subsequent few days felt almost exactly like my experience of recovering from quite bad jetlag after returning from a timezone 5-6 hours earlier than mine.