<iframe width="580" height="385" src="https://www.youtube.com/embed/UCJwzBJj9OM?autoplay=1" frameborder="0" allowfullscreen></iframe> <br>Various studies have linked a lack of sleep to an increased body mass index (BMI) and risk of obesity. A study published last year ... <br><a href="https://www.youtube.com/watch?v=UCJwzBJj9OM">source</a>