The Opening Night Excitation - The Big Bang Theory Wiki | Fandom
: Sheldon is torn between attending the midnight premiere of the new Star Wars movie and celebrating Amy’s birthday. On the advice of Professor Proton (appearing as an "Obi-Wan" ghost), Sheldon decides to skip the movie to spend the night with Amy. This leads to the couple having sex for the first time after more than five years of dating.
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In this episode, two major storylines converge around the release of Star Wars: The Force Awakens :