Sarah Michelle Gellar nearly fell asleep during her sex scene in 'Southland Tales'.

The 30-year-old actress - who plays a porn star in the new film (pics) - struggled
to stay awake for the raunchy sequence because she had just eaten a huge Thanksgiving turkey dinner.

She said: "I filmed a love scene on Thanksgiving and I had eaten all this
turkey and mashed potatoes. I was like, 'I seriously have to film a sex
scene right now?' I was so tired from all the tryptophan - an amino acid in
turkey that makes you sleepy - that I just wanted to sleep!"

Gellar also claims she knew she had made it as an actress when she saw a
porn spin-off of her hit US TV show 'Buffy the Vampire Slayer'.

She added to Britain's Maxim magazine: "I think there was a 'Muffy the
Vampire Layer'. We had a cast viewing in one of the trailers. You know you'
ve made it when they make a porn version of you!"

Kate Bosworth got drunk before filming her sex scene.