When you sleep your body relaxes and your muscles get loosened. Your jaw and throat muscles are no exceptions. As your jaw collapses your throat gets narrower and the tissues of your soft palate start vibrating as you sleep. This vibration leads to the snoring sound.
There are many stop snoring remedies that can make your snoring passages be fully open even when you sleep, but their effect lasts only for limited time (several hours usually) and they are not effective in dealing with the cause of snoring.
One of the most popular snoring remedies is anti snoring pillow. These are pillows which have special design. The middle part of them is lower than the edge parts. So that when you position your head in the middle of the pillow your head, neck and the rest of your body is aligned almost in a line. This helps in keeping your air passages without any kind of obstructions.