During the humid rainy season, if you're feeling sticky and having trouble sleeping, it's a good idea to place a frozen water bottle by your pillow when you go to bed. The condensation ,water droplets forming around the water bottle, can act as a dehumidifier. It's five times more effective in terms of sensation than using the "dehumidify" function on an air conditioner, plus the ice provides a cooling effect and helps save on electricity costs.