I want you to be looking for

1- Relationship between caffeine and sleep disorders?

2- Its impact of sleep problems on adolescent health , behavior, and academic performance.

Also, if you can determine age between 20 to 40 yeas.

I want 10 studies (articles) around this topic caffeine and sleep disorders .These studies have to publish from 2006 to 2016 or 2000 to 2016 .