Questions of general psychology needs help!?

1) Describe the three main categories of medications and the list of two (2) examples of each. Discuss the details, such as changes in perception, may be prescribed, addiction, influences or specific effects on the body. 2) Explain the differences between the rods and cones of the retina. Describe the functions of rods and cones. Where are the greatest concentration of cones and rods of the retina? How can theoretically produce cones for color vision? 3) Describe at least three different psychological approaches to pain management. 4) Describe the different sleep stages (typical chronological order, length, brain activity, REM, etc.) Include a discussion of the theories of dreams in the response. Thank you very much!

What do not you understand? The questions are very explicit, you must verify the information yourself.