During which sleep stage is body temperature homeothermic?

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Multiple Choice

During which sleep stage is body temperature homeothermic?

Explanation:
Thermoregulation during sleep is stage-dependent: non‑REM sleep keeps the body's temperature regulation functioning, while REM sleep largely suppresses it. In non‑REM sleep, the hypothalamus can adjust heat production and dissipation to keep core temperature near the set point, so temperature remains fairly stable. In REM sleep, autonomic responses are dampened and thermoregulation is reduced, so core temperature tends to drift with the environment rather than being actively maintained. Therefore, body temperature stays most consistently homeostatic during non‑REM sleep. (Wake maintains thermoregulation as well, but this question focuses on sleep stages.)

Thermoregulation during sleep is stage-dependent: non‑REM sleep keeps the body's temperature regulation functioning, while REM sleep largely suppresses it. In non‑REM sleep, the hypothalamus can adjust heat production and dissipation to keep core temperature near the set point, so temperature remains fairly stable. In REM sleep, autonomic responses are dampened and thermoregulation is reduced, so core temperature tends to drift with the environment rather than being actively maintained. Therefore, body temperature stays most consistently homeostatic during non‑REM sleep. (Wake maintains thermoregulation as well, but this question focuses on sleep stages.)

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