There are a number of wearable trackers on the market. The majority of them are strap-on you use on the wrist just like a view. Other trackers is often positioned by your pillow or on your own bedside table. There is 1 sleep tracker I specially enjoy, personally use, http://beauagcig.blogdal.com/16732060/how-much-you-need-to-expect-you-ll-pay-for-a-good-deep-sleep