Fixed my shoulder neck pain after 1st 40 minute trial on level 3. Have been using it twice a day and sleep incredible in the evenings. I use level 5 for 40 to 45 minutes, 6 was way too sweaty for me but will do it at some point maybe for less time. My daughter does 30 minutes on 3 before bed and sleeps wonderful. My husband is using it for 40 minutes on 5 for healing softball calf injury quicker and it seems to be helping. We love it.