This forum post is dated 05/23/10. If you feel it is old or outdated, please follow up with a question or comment and someone may be able to update it, or reply with newer information if you have it.
Do you feel sleepy after having your lunch? Do you feel it even more when you are at work? Then what you are feeling is perfectly normal. This phenomenon is called the post lunch dip. And although this is felt by almost anyone, some are immune to this phenomenon.