I've posted something similar to this before, but it bears repeating. Depression is NOT just a condition affecting mental processes. It can attack you physically as well, draining you of the Energy you need to function. Too many people succumb to this loss and opt to lie around in bed, hoping their energy level might become replenished somehow. This is the very opposite of strategies you should follow. I know it seems like an unbearable task, but you gotta Get Up.

If the body is taking clues from the brain, ie. brain is depressed so body is low on energy, isn't it fair to say that the mind may be taking signals from the body as well? When our bodies are low on energy due to inactivity, our minds are quick to pick up on this signal and it acts accordingly. Thankfully the opposite is also quite true. Your mind will respond favorably to exercise. Something as simple as getting out of bed and taking a shower is a good first step and will help your mood significantly.

So don't let your mind trick you into inactivity. Get up and get moving. This is a small battle you can win everyday.