According to an article in Asian E-News Portal, Charmaine said the role she is preparing for has not only given her insomnia, she also has mood swings.
Charmaine said: "Today, I finish filming a scene which makes one's hair standing on end and it is horrible.
"I am totally exhausted and have not regained myself yet, as keep thinking about it.
"My mind keeps thinking non-stop. Oh my god! I have insomnia again tonight."