I tried a few and I like Emfit's tracker the best: https://www.amazon.com/Emfit-QS/dp/B0158W3E2A https://www.amazon.com/Emfit-QS/dp/B0158W3E2A It's nice becaus

I tried a few and I like Emfit's tracker the best: https://www.amazon.com/Emfit-QS/dp/B0158W3E2A https://www.amazon.com/Emfit-QS/dp/B0158W3E2A It's nice because it goes under your mattress so you don't have to wear anything. The results seem to be accurate, at least when it comes to detecting tossing and turning vs sleeping.