What is the meaning of this song: " signs " by bloc party

two ravens in the old oak tree, one for you and one for me
Bluebells in the late December, I see signs now all the time
The last time we slept together, there was something that was not there
You never wanted to alarm me but I’m the one that’s drowning now

I could sleep forever these days because in my dreams I see you again
But this time fleshed out fuller face in your confirmation dress
It was so like you to visit me to let me know you were ok
It was so like you visit me, always worrying about someone else

At your funeral I was so upset, so upset,
in your life you were larger than this
statuesque

I see signs now all the time that your not dead your sleeping
I believe in anything that brings you back home to me