The evidence is convergent. Multiple independent sources reach the same conclusion, the underlying mechanism is well-characterized, and even the field's most cautious voices treat it as worth doing.
One way that we can decrease our transition time into sleep is to accelerate that drop in temperature. And one way to accelerate that drop in temperature somewhat counter-intuitively is to use hot baths, hot showers, or if you have access to one, a sauna.
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But actually, if you are to get into a sauna or a hot shower or hot bath, and then get out, your body is going to engage particular mechanisms for cooling itself off that are going to allow you to drop your temperature more quickly and fall asleep more easily.
if you do hot tub or a hot bath or a sauna in the evening, and you don't stay in for more than 20 or 30 minutes and you get out, you take maybe a cool-ish shower or a warm shower, then what happens is there's a compensatory cooling off of your core body temperature for the reasons we discussed earlier, and your body temperature will drop by one to three degrees and it will make it much easier to get into sleep.
But again, you can use this mechanism of temperature shifts to wake up or temperature shifts to fall asleep in ways that really can help you overcome some of the irregularities in your sleep-wake cycle and exercise cycle, et cetera.