As authored by Brian Resnick with National Journal:

There exists an unexpected challenge in the quest for racial justice. 

In 2005  re­search­ers at the Uni­versity of Cali­for­nia, San Diego, began an ex­per­i­ment that would last five years. The re­search­ers hoped to com­pare how blacks and whites ex­perienced slow-wave sleep. What they found was dis­turb­ing.
Gen­er­ally, people are thought to spend 20 per­cent of their night in slow-wave sleep, and the study’s white par­ti­cipants hit this mark. Black par­ti­cipants, however, spent only about 15 per­cent of the night in slow-wave sleep.

Follow the link to read more about the researchers results, what they mean, and how policy changes might be able to tip things to favor our people.