it helps by keeping you awake

Keeping clean helps prevent disease and helps other factors. Keeping feathers, fur, scales and skin clean of dirt, debris and parasites helps animals stay healthy, prevent infections and helps prevent heat loss and helps cool the body by keeping the isolating fur, feathers, scales and skin at maximum functionality.

Keeping hydrated (i.e. drink lots of water).

Keeping your blood oxygenated (i.e. open a window).

it helps with keeping the tyres inflated.

Keeping the number of senators stable.