I have been reading about magnesium oil for a while and how it can help with sleep and pain. Iherb was offering a free sample, so I ordered one. When I got my order, I tried some, it was about 5pm and I was catching up on my emails. I all of a sudden felt like I couldn't keep my eyes open, so I leaned back in my chair and listened to a David Wolfe video. I was so relaxed I could have fallen asleep! I didn't put 2 and 2 together until the next day. I tried it later the next day along with my melatonin but closer to bedtime and it did seem to help me sleep more deeply. I have been having terrible joint pain at night when I try to sleep and this has been much better. Wanted to pass along my experience with the magnesium oil. I don't know if I have ever been tested for magnesium or what kind of test they would do, so I don't know if or how deficient I am, but it does seem to help, so I will continue as long as I am having good results.