Metronome for sleep

I have been using this used $5 metronome to sleep at night.  My brain cant stop thinking even when im tired. I bought this for trying to improve playing my digeridoo, but it sounds so hypnotic i thought i would try it at night. It really works.  I wind it up set it to the slowest setting and just listen to it and some how im out cold before it needs to be rewound, lol.  try it if you have trouble sleeping or relaxing.  Its cheaper and healthier than medication.