There are comments on Corydalis root (and one of its active ingredients THP) in another thread, which is known in Chinese medicine as Yan Hu Suo, as a sleep aid, which make it sound interesting.
Apparently it does have a history of use in China for:
Action: To promote circulation of blood and qi and relieve pain.
Indications:Chest pain, epigastric pain; amenorrhea, dysmenorrhea, blood stasis after childbirth; traumatic swelling and pain.
Usage:Powder to be swallow[e]d.
Does any one have any more experiences?