Green Tea and L-Glutamine
This has worked for me once, produced a chain of 1 DILD, and 2 WILD's, though they were all very short. I used a 750 mg Green Tea supplement which has 50 mg of caffeine and 1000 mg L-Glutamine. It took about 2 hours to work, and over an hour and a half before I fell asleep again after waking after 5 hours sleep, taking the supplements and going back to bed. Tried again though and nothing though I couldn't go back to sleep for almost 3 hours, the second time. The green tea supplement by itself has also triggered a WILD, OBE, though I feel it is probably a dream, all my WILD's have been as OBE's.