Depression is like
Having a valve open, letting the character and emotion drain slowly out of you.
Losing the will to do anything, and i literally mean anything.
Waking up and thinking "I wish i was still asleep".
Going to bed and thinking "I can't even be bothered to sleep"
Being vulnerable

That's how I've always seen it anyway.
On a similar issue, i always found that my paranoia went though the roof when I was depressed.