They didn't prevent me from going to sleep, but they woke me up several times a night because it felt like my bed was vibrating. I kept covering my little dog up thinking it was him shivering. I took him to the vet and he is a very healthy little boy, both mentally (they were looking for nervousness or being frightened easily) -- and physically. I came home a lot lighter in the pocketbook but with more questions, like "Am I losing my mind???" This only started about 2 months ago. After the vet visit it took me about a week to realize it was me and the vibrations were on the inside. I put my hand on the bed and it wasn't shaking, yet I could feel it shaking. I put my hand on my side and I could feel the vibrations coming through from my back, while laying on my back. I hopped out of bed and looked up internal vibrations and was shocked to learn how many people are experiencing these. I wish I could put a notice on a billboard to reach everyone to let them know that by complete accident I found something that stopped the tremors, for me at least, on day one. Several years ago I developed a pain in my right side and went to my PA and she did an ultrasound that came back showing a "thickening" in my liver. I don't like today's pharmaceuticals and went online looking for natural alternatives in a supplement to support the liver. I was not having internal tremors at that time. I took the pill for 2-3 months and the pain went away so I stopped taking it. About a month ago I started getting this pain back and went online to find the supplement for supporting the liver again. I ordered it and the first day I took it I noticed a couple hours later that I was not having internal tremors. I went all day without them. I asked myself what I did differently that day and that pill was the only thing. I looked up each ingredient and the main ingredient N-Acetyl Cystiene (NAC) has got some unbelievable health advantages to its credit. It is used for Parkinson's and is used to treat tremors, both inside and outside the body. It can be purchased at any health food store all on its own, and comes in 1,000 mg. capsules. The amount I get in my liver supplement is 800 mg. and is supposed to be taken 2 times a day. I, for one can attest, this worked 100% for me. I only take one in the morning because it tends to constipate me if I take 2. I thought it could not be possible this all natural supplement stopped these tremors, and figured it would not last. I'm in my third week and NONE during the day, and rarely any at night. If I could take the pill at night I have no doubt I would have none at night, but as it is, as long as I don't let myself get dehydrated I am having NONE at night either. If I've been working out in the yard and not drinking enough water to keep me hydrated, I may have very mild tremors when I first wake up, but I NEVER wake up in a vibrating bed anymore, and my little dog is very happy that Mom quit covering him up several times a night!!!!