We know sleep quality is vital for good health, that adolescence is an important time for brain development, and that teens don't always get a huge amount of sleep – and new research gives us some fresh insights into how that all fits together. With data for 3,222 adolescents between the ages of 9 and 14 years of age, researchers from institutions in China and the UK split the cohort up into three groups: those with the worst sleep habits (averaging 7 hours, 10 minutes per night), those with the best sleep habits (7 hours, 25 minutes), and those in…