I ran across some notes I took a few years ago when I asked a physician, what can you tell me about hormones and sleep? So allow me to share this little tidbit of information from Dr. James C. O’Brien:
Hormones are produced during sleep, usually during slow wave sleep or Stage 3 sleep.
The only hormone actually secreted during sleep is Growth Hormone (during slow wave or stage 3 sleep)
Many hormones are manufactured during slow wave sleep, but not released, including FSH, LH, proinsulin, TSH, testosterone. These hormones, although manufactured during sleep are not released until the hormonal mechanisms for their release are activated usually during wakefulness. Cortisol is one of the first hormones released at the start of the day, which give us our initial burst of morning energy.