Sleep apnea is pretty nasty stuff in more ways than we might think. I have suspected this for years and have a referal that I have been neglecting to follow up with until my most recent bloodwork demonstrate some abnormalties. I believe that a partial culprit may be sleep apnea. Of course I am no doctor and will seek treatment from a professional. I just thought the topic was interesting.
Decreased Testosterone Levels Linked To Sleep Disorder
Sleep apnea may increase risk of diabetes
Neuroendocrine dysfunction in sleep apnea: reversal by continuous positive airways pressure therapy -- Grunstein et al. 68 (2): 352 -- Journal of Clinical Endocrinology & Metabolism
SpringerLink - Journal Article