Growing Pain

I never heard about growing pain until recently.
YF was crying almost every night saying leg pain.
He always show me his ankle pain, or mucles pain.
Until one day, I read an article about growing pain in newspaper.
It happens on kids, at mid-night, at clave or ankle, and go away in the morning.
I asked the problem to the child specialist, the Dr told me the same.

What should we do... we just got to bare with it, wake up every night and massage for him? for dono how long???