The warming of bathwater causes vasodilation, leading to the transfer of heat from the core to the periphery, promoting relaxation and a subtle drop in core body temperature, which is conducive to sleep. Our evolved response to temperature changes further supports the correlation between a warm bath and the onset of sleep. Additionally, maintaining a slightly cooler bedroom temperature, around 18 degrees, is generally ideal for promoting sleep; however, individual preferences vary. The effectiveness of sleep is also influenced by the bedding and the balance of insulation to maintain warmth without causing overheating or excessive cooling.

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