Can anyone help me identify a small flying insect?

My garden and house have been invaded by thousands of small, flying insects like tiny beetles with brown, elongated bodies about 5mm long. I couldn't get a good picture as they move about too much. When you crush them you get a sweet sticky material on your fingers that smells faintly of cinnamon. I've looked on the web but the sites I tried didn't help much. Anyone any ideas as to what they might be?