Just tired all the time

My coworker, Ms E has been telling me that she is tired every day.  No matter how many cups of tea or coffee she takes, she is still tired.  I told that she needs to get to bed earlier then but she is already doing that.  Then if going to sleepland is not working, maybe taking some energy pills might help to wake her up and give her the energy to last through the day.   I know how it feels when one is tired all the time.