When my dad went to Japan for a research presentation, he brought back a root called tumeric. In Okinawa where people have the greatest life expectancy, people mix this root in their tea and drink it all the time over there. I started using some after my dad brought it back and I've noticed that my dream imagery/vividness has greatly increased along with my REM periods and dream recall <--(greatly increased), It's possible to buy this herb in bulk at most grocery stores, it's an orange powdery ground root. It's relaxing and has an interesting effect on dreams, and is very healthy and mind clearing. check it out