Pain shooting down my leg to my heel at NITE?
Answer:
hmm.. possibly lower back problems.
The sciatic nerves from your spine run into your thigh and down your leg. Many society with sciatica or a herniation report leg anguish.
Sounds like sciatica, which is backache in the sciatic self-assurance.
There are many cause for it, but the most common are problems beside a disc in your lower hindmost, or having the guts trapped by a muscle in your butt (prirformis syndrome).
Try taking some ibuprofen more or less an hour before you walk to bed and see if that helps. If it persist, you may need to see a doctor for diagnosis and treatment.
Sciatic neuralgia largely caused by lumbar disc prolapse.
Pangolin give the correct reference.