"Shift work" under Section 60C of the Employment Act is not applicable to you. There are quite a lot of people like you working in companies dealing with overseas clients in different time zones. The terms and conditions for working throught out the night should be agreed upon between you and your employer.
KL Siew has put up a sister site by the name of mylabourlaw.net, which is in effect a more user-friendly version of the present popular pesaraonline.net. The site is in the process of being fine-tuned but it is fully functional. You are invited to visit the website at http://www.mylabourlaw.net and give your views or suggestions. Queries can be posted and be responded from there as usual.