i hope you are joking? please cite that information cause that makes no sense.
first of all, morning wood is the bodies natural response, preventing you from pissing yourself.
second of all, to the OP, it depends on the situation...were you with a girl and couldnt get hard? i havnt heard of anything like this before, however whats your age? The word juvenile can be broad.
i doubt its anything to be concerned about.