"upper body heat sensation"

When Your Heart Feels Hot Every Night and Keeps You Awake: Donguibogam's Guide to Cooling 'Insomnia Fire'

Do you spend your nights feeling your pillow grow hot, unable to fall asleep as your heart pounds? Anxious thoughts keep linking one after another, and heat feels as though it surges straight to your head. Your body is clearly exhausted, yet your eyes stay wide awake. I deeply empathize with this painful cycle of insomnia.