 [ Symptoms ] when i first lie down my lower back erupts in sharp pain sometimes it goes away sometimes not i am a 20 yo female lying on side or stomach is the same  laying down i have to tense up those muscles or its painful if i arch my back the pain goes almost completely away and after a while i can relax without issue unless i am lying on my front i exercise every day i have a desk job and i am on my feet a lot i eat right and do not smokedrink what do you guys think i have tried stretching before lying down but i am not really sure how i should etc so any tips would be most helpful [ Disease ] you could try a specific lumbar stretch lie on the floor get there any which way you can  and with knees bent tighten you abdominal muscles and focus on trying to eliminate the space between the natural lumbar curve and the floor by pushing down i have the same problem at times and it helps