I can see the way your thinking, ive done a couple of checks and from the papers I can find here are some average HGH secretion levels:
At 20 years old we average 500 micrograms/day
At 40 years old we average 200 micrograms/day
At 80 years old we average 25 micrograms/day
so with that conversion it looks like we produce alot more than what your thinking we do, or I should say if your under 40yrs old
How long have you been pinning at night?