1. INTRODUCTION
Sleep is an essential function of the human body and has a direct impact on our physical and mental well-being. Research has shown that sleep disruption and disorders have a strong causal link to major lifestyle diseases such as memory loss, obesity, diabetes, and cancer [1], [2]. Unfortunately, sleep disorders are highly prevalent in our society — studies show that nearly 40% of United Kingdom adults and roughly 50–70 million American adults experience them [3], [4]. Cognitive Behavior Therapy and pharmaceutical sleep aids are two common clinical interventions to alleviate sleep disorders. However, they are expensive and have potentially harmful side-effects [5], which has led to research in designing non-invasive, low-cost interventions to address sleep disorders.