The first night after I put the cerbere33 under the bed, I felt weird, It had the sense of being on a trampoline with insomnia, and then, other days, wonderfull! I feel much better in my room, I make fewer nightmares and especially I sleep much better. I installed a Cerbere33 in each rooms of my children because they used to have bad dreams and weirds nightmmares, now things are fixed and no more disturbing nights. I frankly recommended it to many friends and they had the same result. I will carry on to recommend it.