Wake Up Sex 

The best sex in the world. Occurs when you and your partner are both sound asleep and then slowly wake up having sex, in the middle of the night.
Its a trip from Dream State to Horny State.
Afterwards you go back to blissful sleep.

John: "What happened last night?"
Peter: "We had Wake Up Sex"
John: "Whats That?"
Peter: "We were asleep in each others arms and then i was half awake and we were already having sex and it was weird 'cause it was like it was a dream but then we realised it was real so we took it to the next level.It was so horny!"

Wake Up Sex by fnky January 25, 2006

Wake-Up Sex 

When whoever's in your bed can't get to sleep/wakes up and decides to penetrate their partner without warning. Often used in porn.

I can't get to sleep, I'd better have some Wake-up Sex

Wake-Up Sex by ubersquirl August 18, 2012