Sleep lyrics

How can it feel so nice?
Why does it feel so right?
I think I've been somewhere special
I want to go back there
Sleep
I think I will
Go back to sleep
Oh it's so cold and shivery outside my cocoon
Now I'm on my way
Sleep
Oh sleep
Sleep
[ Lyrics from: http://www.lyricsmode.com/lyrics/i/imogen_heap/sleep.html ]