Final answer:
REM sleep does not inhibit GH secretion; instead, it stimulates GH release. Hyperglycemia, elevated plasma levels of amino acids, and cortisol do inhibit GH secretion.
Step-by-step explanation:
Among the listed choices, the factor that does not inhibit GH (Growth Hormone) secretion is REM sleep. Factors that inhibit GH secretion include hyperglycemia, elevated plasma levels of amino acids, and cortisol. REM sleep, on the contrary, actually stimulates the release of GH, thus having a beneficial effect on the levels of this hormone. GH is essential for growth and the regulation of metabolism, and its secretion is intricately controlled by various physiological stimuli.