A nurse is teaching a class about physiological changes that occur during non-rapid eye movement sleep. Which of the following changes occur during non-rapid eye movement sleep?

Choice A reason: During non-rapid eye movement (NREM) sleep, the body’s core temperature decreases as part of the circadian rhythm’s regulation of thermoregulation. The hypothalamus reduces heat production and promotes heat loss, lowering body temperature by about 0.5-1°C. This physiological change conserves energy, supports restorative processes, and aligns with the reduced metabolic demands of NREM sleep stages. Choice B reason: Peripheral blood vessels dilate, not constrict, during NREM sleep to facilitate heat loss, contributing to the decrease in body temperature. Vasodilation enhances blood flow to the skin, promoting heat dissipation. Constriction would retain heat, counteracting the body’s thermoregulatory goal during NREM sleep, making this an incorrect physiological change for this sleep stage. Choice C reason: Growth hormone secretion increases, not decreases, during NREM sleep, particularly in slow-wave sleep (Stage 3). The pituitary gland releases growth hormone to support tissue repair, growth, and metabolism. Reduced secretion would impair these restorative processes, which are critical during NREM sleep, making this an inaccurate description of physiological changes in this phase. Choice D reason: Basal metabolic rate decreases, not increases, during NREM sleep due to reduced energy demands. The body conserves energy by lowering heart rate, respiratory rate, and overall metabolic activity. An increase in metabolic rate would occur during wakefulness or rapid eye movement sleep, not NREM, making this an incorrect physiological change for this sleep stage.