One time when I used it on my leg/knee area, I couldn't sleep because it was so uncomfortable from the this balm. Another time it really helped my back pain so I actually did get to sleep! Also , It might have been summer for my leg/ knee pain with discomfort, and fall or winter for the back pain relief when it worked well. Go figure. Thank you for making this @ J.R Watkins company! I got mine I believe at Bartells for either $8.99 or $9.99. It seemed spendy, but it contains a good amount of product. I believe it to be travel friendly. Adios!