Capsasain creme, although it seems to burn the skin of most people, worked for me.

My pain only starts when I lie down at night and fall asleep. Within a few hours I wake up with all the pain symptoms.
If I don't do much walking, and sit in a good posture, I am practically pain-free all day.
Anyone else have a similar pattern?

Lying down flat? That extends the leg and stretches the Lateral femoral nerve.

Mine which is in mostly a remission, will twinge if I over extend the leg doing something, or expose it to heat of any kind.
(hot tub, hot bath, steam room, heating pad, etc).

Try putting an ice pack on your groin area when you lie down.
Or if that is not the trigger, put it in the lumbar area on your back
at L4-L5 area and see if that helps.

A strong magnet may help too... Here is my magnet thread:
http://neurotalk.psychcentral.com/thread118248.html

I sometimes use a strong magnet in my groin area for about 20 minutes if I have twinges lying flat. But not often.

I really fixed my MP pain with Lidoderm patches, applied to the area where that nerve exists the abdomen...at the top of the thigh. I thought that was a miracle at the time! Now I don't need anything often anymore, after years of anguish.

Similar, yes. I have MP with my Left thigh. I'm on CPAP therapy and normally sleep on my back with legs out straight. But with MP I either can't get to sleep or I wake up a couple hours later with pain. Lying on my left side knocks down the pain significantly. I can also knock down the pain while lying on my back by raising my left leg on top of several pillows or rest the left knee against the wall. I guess it relaxes the tension in the nerve. I'm on my feet at work 7 hours per day, and am have constant symptoms. Best of luck, CUBuff.