A total score over 10 should be reviewed carefully, with all positive responses evaluated. A score between 15 and 20 signals a significant degree of daytime sleepiness and should alert you and your teen that she needs to get more sleep.
This scientifically validated measure of sleepiness* is used widely to assess adult daytime sleepiness over the past week or so. You can answer the questionnaire yourself, to get an idea of your own sleepiness level in an effort to lower it, or encourage your 20-something daughter to fill in the blanks. There are eight questions with a 24-point scale.