I can definitely recommend the Zeez Sleep Pebble. I have had mine about four months now and my sleep has improved so much. I must admit I don’t understand the science behind it but that doesn’t matter. Customer service is brilliant and its founder Anna is always there to help and offer advice. She did advise me to switch off all devices on going to sleep, but for various reasons I couldn’t manage this, but the sleep pebble still worked for me. Only downside is that you need to charge it every 9 days or so and it takes hours to charge. But I would say…go ahead and invest in this…it might change your life for the better.