NO JET LAG PILLS HOW DO I PROPERLY TAKE?

I purchased NO-JET LAG homeopathic jet lag prevention pills because I have a 16 hour non-stop direct flight coming up. Here is the issue. The box states to take one table at take-off and one tablet every 2 hours while flying and finally one after landing. My concern is how it will interrupt my trying to sleep on the plane? My flight is at 5:00pm so ideally I would like to stay awake until about 11:00pm and then try to nap or sleep. So if I were to take NO-JET-LAG chewable tablet, I am just afraid that it may keep me alert for much longer than anticipated as I would like to be able to fall asleep on plane since it is very difficult in itself to sleep on the plane I do not think that taking the tablet would make my situation better somehow??? What would you recommend the best way for me to do this since I would like to sleep on plane would it be better to just take one just during landing??? Let me know, I really would appreciate any advice or answers!!! :-)