Try melatonin odeon, in time with the usual, natural sleep times (a downer the first night or two can be of use too, PM me if you want advice on where to get hold of some RC benzos, by all means), melatonin isn't really a sedative, but rather a (the?) hormone/neurotransmitter that regulates circadian rythms.
Would be a good idea to take some before setting off on a transatlantic flight too, as melatonin is both an excellent antioxidant, that doesn't undergo redox cycling, and a potent radio-protective agent, and of course, one gets exposed to more radiation up at howeverthemanyfuck thousand feet than down here with plenty atmosphere to block some energetic radiological nasties of the kind melatonin would be well-suited to.
Not sure how accurate it is, but I have read somewhere (forget where) that quite a bit of jet-lag is if not actually due to, very likely potentiated and exacerbated by the radiological exposure during flight time.
