Poor little guy.

Has he fallen over recently and perhaps hurt his legs?

I can remember when I was a kid, a bit older than your DS but I would have horrible leg pain which would keep me up at night.

I think I may have been told that it was "growing pains". Maybe an old wives tale but I did eventually grow out of it.

Could it be restless legs syndrome?

I'd wait half an hour to see if the panadol has any affect...if he still hasnt settled then perhaps you should take him to ED.

Trust your instincts hun...you are his Mum and will know if something is up.

Hugs!
x