Cortisol and T are normally higher in the morning. Example: when people are prescribed a gel they are instructed to apply it in the morning to emulate more natural production.

Read this on cortisol and resistance training:

http://www.ncbi.nlm.nih.gov/pubmed/20560706

And this on cortisol, T and training all play together. Pay attention to the effect CHO has:

http://www.ncbi.nlm.nih.gov/pubmed/11905937

hope it helps,

kel