LPT: heat the outside of your neck for sore throat that keeps you awake at night.
edited to add.
This is a last resort tip, try other things first, many tips in the comments.
Do not use this method if you cannot get the temperature low enough. We are aiming for 38 - 43 degrees Celsius (around 100 - 109 Fahrenheit) Slightly over body temp. You do not need high heat. Prolonged heat at above 44 degrees Celsius can lead to burns that you don't notice because of the low temperature. Later with fabric until you get the right heat, try with a thermometer after attaching it to your neck if you aren't sure(if you have a fever please check with a thermometer as your temperature can affect how you feel heat. I checked my own and it was 39 degrees. Between the neckerchief and my throat. Be extra careful with electrically heated objects, they might increase in heat after a while.
original post:
I have a very sensitive throat from having GERD. I often get a persistent cough from just house dust, and when I get a cold and a sore throat it can be hell with the added post nasal drip keeping me awake at night.
I've tried all sorts of things over the years, and now I think I've found the most helpful one.
Of course the obvious ones are stay hydrated and use a humidifier. But this is often not enough. This time I tried to keep my throat warm, as I sometimes find drinking warm water helps, and a warm shower too, but always only temporarily. I used those reusable hand warmers, rolled up in a neckerchief and tied around my neck, positioned the warm part to my throat (careful that it isn't too warm)
I'm guessing a heated scarf or neck warmer will be easier if you have one.
I also find that carbonated water is better than other things too stop the itch if you feel the urge to cough. (Don't make it a daily thing though, it's slightly acidic and can be bad for your teeth if done regularly)
Sitting half upright in bed, with my heated throat and a bottle of carbonated water with me I finally got some sleep.
Hope this can help someone else too.