Standard advice says "cool room" but analyze: should I use temperature gradient? Map the gradient strategy: cooler head, warmer feet using separate blankets/cooling pillow. Calculate: if I optimize head vs. foot temperature separately, does sleep improve? Show me the gradient setup: these tools at these temperatures. Give me the implementation: cooling pillow, weighted blanket, foot warmer combo. Include: whether whole-room cooling is less effective than targeted temperature control, and tools to create gradient.