There are a few things that are supposed to be very good for sleep that are natural...

They are Suntheanine, a threonine extract made from green tea that is sedating.

So is Lemon balm and Passion flower tinctures. Also Hops and Cammomile. Vitamin Shoppe has most of these.

And there is a homeopathic remedy called nerve tonic that can be good for stress.