But when scientists examined an enormous amount of accumulated data on self reports of insomnia and people's actual sleeping patterns recently, that's not what they found. (inc.com)
For example was it an actual experiment or just based on self reports? (psychologytoday.com)
Even so, the striking finding is that these patients do improve their mental health and social functioning, whether measured by self report or observer ratings. (ebmh.bmj.com)