1. Dream Argument(analogy)
A.Layers of reality
B.Doesn't something have to exist in order to provide the raw materials from which dreams are made?
C.Lucid dreaming
D.We know what dreaming is, its a brain fuction.We can know if were dreaming with practice and training.
E.Skeptical attack on a posteriori knowledge(knowledge is based on sense perception).
F.How do I know my senses are reliable?How do I know I'm not dreaming right now?
G.Scientific study of the brain.
H.Sleep perception
I.The model presupposes a phyical world of the type the senses portray
J.Circular reasoning

2. Arch Deceiver Argument
A.Suppose a being of great power and intellegence is trying to fool you, all the time.
B.How could you ever be justified in any belief?
C.How do you know ther isn't such a being?
D.Attack on a priori knowledge(independant of sense perceptions or experiences)Math,Logic,Concepts.