Why would the blood levels of several hormones, for example thyroxine, GH, and cortisol increase at night and decrease during the day?
Several hormones are released during night time during sleep such as growth hormone, cortisol. Growth hormone is essential for tissue repair and growth. Sleep allows hormones to replenish to provide us with the energy to perform activities at daytime. Cortisol levels are increased during sleep to boost acts as a wake up signal. It makes the person hungry and alert. Biological clock stimulates Thyroxine release during night time by communicating with with cells that produce TRH in the hypothalamus.
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