If you want an insight into somebody's true personality, then try to catch a glimpse of the way they sleep. Scientists believe the position in which a person goes to sleep provides an important clue about the kind of person they are.
I have found it helpful to do the stretching exercises my physical therapist recommends. Do some core strengthening exercises, such as the ones highlighted at The Mayo Clinic. By keeping your core strong, your back won't put itself in a position to cause that sciatica pain you are having.