Worked unexpectedly well.
My 10-year-old niece was having trouble sleeping --- both falling asleep and sleeping through the night.  I bought this as a last resort to avoid having her pediatrician prescribe sleeping meds.  It worked from the first night she tried it.  She fell asleep within a few minutes, wasn't restless, and woke up refreshed when she was supposed to.  Who could ask for more?  It's continued that way for almost two months now.
Rating: 5 stars