what could this be?

Cindy💕 • 18, mummy to George 31/07/16👶🏻💙 fiancée of a amazing man 5th Jan '16💕
My left cheek keeps twitching, I noticed it a few days ago but it only lasted about 15 minutes but now it's doing it again and I'm struggling to get to sleep because of it, anyone had this and know what it could be?