I think people are beginning to get the message that inadequate sleep is a problem rather than a sign of an exceptionally productive person and is not to be admired. Research led by scientists at the University of Ottawa and recently published in Behavioral Brain Research underscores the importance of good sleep.

They found that adolescent mice deprived of sleep demonstrated signs of depression.  Female mice in particular released stress hormones in addition to signs of depression.  This occurred after only seven days of inadequate sleep.

You can read a summary of the study at Science Direct and the full study here.