DREAM ARGUEMENT
?'s regarding argument:

Doesn't something have to exist in order to provide the raw materials from which dreams are made?

We can know if we're dreaming with the right training? We know that dreaming is a brain function, suggesting that this knowledge exists in wakeful life.
-This misses the point=what if brains are just part of a larger dream?

How do I know my senses are reliable, that I'm not sleeping/dreaming right now?
Possible Answer: scientific study of the brain, sleep perception=but this presupposes a physical world of the type the senses portray

ARCH DECIEVER ARGUEMENT (EVIL GENIUS ARG.)

Suppose a being of great power/intelligence is trying to fool you all the time
How do you ever justify any belief?
How do you know there isn't such a being?

=attack on A PRIORI knowledge (independent of sense perception, not based on experience but on logic/reason)

Question we left off with:
Is there anything the arch deceiver can not fool me about?