Your friend shares with you that anytime she gets less than 8 hours of sleep that she feels lousy the next day.
Does a person really need 8 hours of sleep?
What evidence would you provide to either support that every person needs 8 hours of sleep or that they do not?
How do you think your life could be improved by changing your own sleep habits (when and/or how long)? Make sure to share both the possible positive and/or negative effects that could come from this change.