Being curled up and just about to fall asleep surrounded by the boyfriend (of 6 months yesterday! Hurrah!).
Also:
* Getting a genuine smile back from a complete random in the street (I like smiling at pensioners in particular)
* The high after finishing a brilliant dance to an awesome tune (in my case, usually dancing lindy hop)
* Those moments when you realise how truly brilliant your friends are (in terms of either compassion or wit - best when both)
Oh, and waking up still surrounded by boyfriendness on a morning where there's nowhere to be, and nothing to do.