I recommend plant therapy from Zeller. You can find it in a pharmacy.

The name of the tablets are Sommeil forte or Schlaf forte.

It won't knock you out like the hard stuff, but at least you aren't all dopey the next morning. You take it an hour before you want to be asleep and hope the best, repeating the procedure every night until you are back into a normal sleeping pattern.

Why would anyone go to bed at 6:30 pm though? No matter how tired you feel in the early evening, it's better to force yourself to stay up until 9pm to be sure to sleep the whole night through!

Good luck!