Dr. Oz has a simple banan tea recipe but I am unable to supply the link.

All that has to be done is to boil a small pot of water. Cut off the ends of a raw banana, place it skin and all in the water and boil for ten minutes. Use a colander to strain the mixture and drink one hour before bed.

A friend of mine has tried it and had success three nights in a row.

Go to the Dr. Oz link for details.