Tired of being tired.

There are two kinds of training tired - the first one (the good one) is the tired you feel after a solid session.
There there's the shitty tired. That's the tired feel before you start a crappy session.
If you only ever experience the first kind of tired then you're not training hard enough.
If you're training well all the time then you're not training well.
But if you only rarely experience the first kind then you're certainly not training well either.
You should start your builds feeling the first kind and end them feeling the second kind.
If you've gone more than 7-10 days in a row only feeling the 2nd kind then I'd say it's time for some recovery. How long you need and in what form is specific to the athlete.

Just something I wanted to put out there.