Low back pain and stiffness upon arising in the morning could be a sign of DEHYDRATION!
TIP: Take a 12 ounce glass of water to bed with you -- drink the WHOLE thing and IMMEDIATELY lie down (before setting the glass down) -- this is the important part!
If you get up during the night, repeat the process.
I've done this many times and it works pretty well. Helps with whole body pain/stiffness, not just the back. The only drawback is having to get up to pee in the middle of the night -- but feeling better in the morning is worth it.
HINT: try taking some Valerian, Hops, Skullcap or Passionflower before bedtime -- if you do have to get up during the night, any of these will help you fall back into a peaceful sleep!
Here's to feeling better tomorrow morning! :)