I would advice against a cold shower before bed ! A cold shower to “cool off” might seem a good immediate choice. We feel cooler because of the combination of the cold water and the decreased blood flow to the skin, but in fact our core will get warmer because of reduced heat loss from the body without skin blood flow. Some minutes later, we feel hot again. Think as well about the sauna and the cold water bath; it increases circulation !
Rather I would strip down (less clothes) and use less blankets (just a sheet), open windows, use a fan or even better an aircon

have cool shower before you go too bed,sleep without the covers is another trick to do and an upright fan blowing on you too. you did not say what type of fan you use,but find a movable one is of more use

Air conditioning is such a life saver, I cannot stand too hot nights and for the kids benefit I swear by my split systems in the heights of summer

Older post, just checking in to see if you found a solution.

any medications you are on? some cause sweating. i sleep on towels and wake up soaked some nights in a 18 degree room. i feel cold but my body sweats still.

I always get hot at night even in the middle of winter. I don’t wear bed socks to bed for this very reason. this way I can hang a foot out to cool me down. Also you could wear something with short sleeves. Try stop your caffeine at 12 noon also. maybe you need to drink more water and take some water to bed with you. You should also get to see your GP and see what is going on.

Do you have a fan on? I cant even sleep without a fan anymore. Open windows?? Umm maybe a damp cloth on your forehead?

light blankets and clothes and a fan

It could actually be your mattress! Make sure the mattress is allowing air to circulate. I can’t use those memory foam mattresses because they wrap around me to much.

Cool, icy water to sip on and a moist cloth

was going to say cold face washer, but it’s been said.

a cold towel (wet ) on your body

there are some good comments here

Wet towel or washer around your neck or on your body

wet flannels and ice packs are great