I coil at rest beside the wall, yet roar to life when duty calls. I bring relief through spray or stream, to thirsty roots or fiery scenes.

The hill where walking's dicey, or a book that's somewhat spicy.

Change my middle to a D and ride a bike. Remove my last and fight for animal rights Pick me one by one and see who you like Spread a lot of me over the honeymoon suite for romantic nights

Some keep ice, an Igloo’s nice. A cold front brings this air to life. A pillow’s other side at night. Too hot to eat? Wait for this to bite.

I come at a different time every day, In moments between nights or days, my part I play. You can expect me to wake the cold, harsh lights... Is this riddle too silly for your mights?