i've had this problem FOREVER! I've almost always taken about an hour to fall asleep,and i ALWAYS wake up groggy and exhausted,no matter if i get 7 or 8 hours of sleep or even 9. Sometimes i wake up on my own,sometimes not,and either way,i'm too tired to get up for a while. I know Steve has a blog about this,he basically says to only go to bed WHEN you are tired,but always get up at the same exact time. I HAVE done that and its never worked for me so i think some people are just naturally slower to start and slower to slow down