This is a TRUE statement. People develop social skills and friendship groups at their own pace and many people to find the process of forming friendships and gaining confidence in this regard difficult. However the second element of the statement is also very true in that strong well founded friendships are invaluable in maintaining ones well being.
Fatigue has many of the same dangerous affects as being intoxicated. Research has shown that if you haven't slept for 17 hours, it has the same effect on your driving ability as having a blood alcohol concentration of 0.05.
