Correct Answer:
Hormone Imbalance
Lack of sleep can affect the levels of hormone in the body. Various studies have shown that sleep deficiency increase the level of stress hormone cortisol that is controlled by the Pituitary gland. Moreover, the hormones that regulate the appetite in our bodies are largely influenced by the duration of sleep we get. Therefore, the correct answer to this question is option a. Hormone balance may be caused the sleep deficiency.