A report in the Sleep Medical Reviews journal, revealed that both sleep and body core temperature is regulated by the brain’s circadian clock which drives the 24-hour patterns of sleep and wakefulness. Our body temperature is lowest while we are sleeping, and the drop in body temperature after a bath helps to prepare us for sleep.
“Taking a cold shower or bath can actually be counterproductive as when our body is submerged in extremely cold conditions it tries to regulate our core temperature. This means you could actually feel hotter than you did before you tried to cool down.”
“By taking a hot bath we are able to drop our body temperature as it stimulates our bodies thermoregulatory system. This increases the circulation of blood throughout our body and results in the removal of body heat and therefore a decreased body temperature” said Drench.co.uk
Previous research from the National Sleep Foundation also suggests that this method works in heatwaves. Its online guide suggests that some people “do better taking hot showers and hot baths when the room temperature is very high”
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