I have improved my deep sleep by taking lavender oil extract capsules. They help relax and give me a 'knock-out' feeling that rapidly induces sleep. I also don't wake up in the middle of the night anymore when I take them. Unfortunately the quality of the extract varies wildly, I would get the same effect with 80mg as I would with 400mg from another supplier. Doubly unfortunate is that one rapidly builds tolerance to it. I use it every 3rd day, so I get a deep, restful sleep twice a week.

Quite a few sleep supplements have started adding it to their formulas recently, using melatonin to initiate sleep and lavender oil to sustain it. It remains to be seen what side effects it has taken long term - there aren't any studies about this available as far as I could tell.