Separator

First of all, I think these are the correct lyrics, with the changes in asterisks*:

It’s like i’ve fallen out of bed from a long and vivid dream 
the sweetest flowers and fruits were hanging from the trees 
falling off a giant bird that’s been carrying me 
it’s like i’ve fallen out of bed from a long and vivid dream Just exactly as I remember
 Every word, every gesture 
 I’ve my heart in my mouth It’s like I’ve fallen out of bed from a long and vivid dream
 Finally I’m free of all the weight I’ve been carrying

And as that woman blows her cover 
In the eye of the beholder 
I’m a fish now, out of water Falling off a giant bird that’s been carrying me

I fell open, I lay under
 At the tip out 
I lost your number
 I wanna slip over And get back under

If you think this is over, then you’re wrong 
If you think this is over, then you’re wrong 
If you think this is over, then you’re wrong 
If you think this is over, then you’re wrong

It’s like I’ve fallen out of bed from a long and vivid dream
 Finally I’m free of all the weight I’ve been carrying Wake me up When at last you'll give in

I think it's pretty obvious it's a song about a woman. Not exactly a straight-up love song, but sort of a fantasizing song - perhaps about what could have been, or reminiscing about a one night stand or fling that resonated deeply, or about dreaming about someone you want deeply, but only had a bittersweet taste of.

"I wanna slip over and get back under" says it all. I want to go back over to your house and get back under the covers, or under you. Or maybe do so for the first time.

The whole first verse is about recalling the amazing moments they shared together, and how he remembers each nuance of it with clarity. Or, it's a vivid fantasy about the girl whose number he lost. And either the fling or the fantasy was like being carried by a "giant bird," and whatever it is ends abruptly, and he crashes back to earth. It's a harsh reality check. In one sense it's somewhat relieving: "finally I'm free of all the weight I've been carrying." Sometimes relationships with amazing people (or desiring them) can be intense, so finally being free of them is a load off one's mind. But "wake me up when at last you'll give in" implies he wants more. It's the double-edged sword of love and desire.

And, as far as "if you think this is over, you're wrong," it's pretty clear how that applies to that sort of relationship. Certainly it's an elegiac / cheeky / appropriate line to slip into the last song of an album, but I think the band has too much integrity and respect for the music itself to use it as some marketing tease for a part 2, or a hint about their future plans. Not to say they aren't fully aware that it would be eaten up by theorists, and that it wasn't emphasized to mess with peoples' minds, but ultimately it's on topic with the rest of the song. The same can be said about the title of the song.