“Americans spent an estimated $41 billion on sleep aids and remedies in 2015, and that’s expected to grow to $52 billion by 2020,” declared BBC researcher Natana Raj (1). The success of this massive sleep industry speaks volumes about the amount of rest that people are getting. According to a recent report from the Centers for Disease Control and Prevention (CDC), over a t … [Read more...] about An Optical Approach to Sleep