<human>: Can you summarize the given text in a few sentences?

I am flying from Vancouver to Glasgow on an overnight flight, arriving at 6am Glasgow time, a total of 8.5 hours in the air.  I then need to drive 300kms south almost right away to make it to the wedding in time.  

Any suggestions on sleep aids that aren't going to mess me up? I've heard good things about Melatonin and Valerian Root. Anything else?

A few details:

* I have shifted my sleeping schedule so that it matches British Standard Time, so I am literally getting up at midnight and going to bed at 4pm, training myself in advance.
* The flight will be taking off approximately 1 hour before my shifted bedtime. So, if I can attain sleep, it would be at my new normal time.
* It is a charter flight, so no business or first class.
* I am *extremely* sensitive to noise. I will be taking ear plugs for sure.
* I have a custom mask I will be bringing to block light.
* I will be at the airport 24h in advance of the flight to book a window seat (my g/f will be sitting in the seat beside me)
<bot>: I am trying to find out if there is a supplement that I can take that will promote sleep while not making me groggy on the other end.  I'm also looking for other advice on how to sleep on a plane.