What Causes Sharp Lower Back Pain And Right-sided Body Pain During Sleep?

I have sharp pains in my lower back on my right side just below my rib cage when i lay in bed at night. After i am asleep for about 3 to 4 hours I wake up in pain like i have a pinched nerve and can only get relief by getting up. After being out of bed for about an hour in the morning the pain goes away and does not bother me all day. but the next night when I go to sleep it returns and some times it is so intense i cant hardly breathe. For the first hour in the morning when I am trying to get over the pain if i bend over or move in the wrong direction it will hit me like a knife in the back so i am very careful to move slowly and stretch in the morning until I loosen up.