Dr Kawashima's Brain Training/Brain Age: How Old Is Your Brain
Ah, the classic dream where you fail a test. According to our research:
"These dreams usually have to do with your self-esteem and confidence or your lack of. You are worried that you are not making the grade and measuring up to other people's expectations of you. You may also experience the fear of not being accepted..."
Yes, you MUST jump on the DS bandwagon and you MUST play Dr Kawashima's every day for the rest of your life. Get smart, stupid!

Metal Gear Solid 2
You remember the bit where everything goes pear-shaped and Raiden finds himself naked in a surreal, dream-like scenario? Well, you can actually read a lot into this. You've spent the whole game hiding, which is said to mean in dream terms that you are keeping some secret or withholding some information.

On top of that, the nakedness can represent a fear that people will see through your true self and you will be exposed as a fraud or a phony.
Also, "To see a tanker in your dream, represents the need to defend yourself and stand up for your beliefs without being confrontational or violent." What, like avoiding confrontation through hiding? Most intriguing...

And finally... Any instance of slowdown
To dream that you are moving in slow motion signifies that you are presently going through a hard time and experiencing great stress in your waking life. Just like when your console can't process everything on-screen and goes into a crawl. Too much stress! Looks like there's more truth in this stuff than we first thought.

If you keep dreaming your teeth are falling out or that you're running very slowly and want to know why... you'll probably never know.
But you could try dreammoods.com, paranormality.com, dreams.ca, 
bellaonline.com or freedreaminterpretation.co.uk - the sources of our dream knowledge here. Or, alternatively, why not just scare everyone silly with your nightmares about Barbra Streisand in the forum? Pleasant dreams...