Sleep drugs such as lunesta and ambien induce sleep because they

Ambien and Lunesta are both powerful prescription medications used to treat persistent insomnia. Both are in a class of drugs called nonbenzodiazepine hypnotics, which act on GABA receptors in the brain to induce a calming effect that is helpful for initiating sleep.

well when looking at this if you think about it   negativley and positivley   react with each other and when the first layer gets full they add layers it starts with 2 on the first layer and it constantly goes on until the official number is there

a. steroid--> influences moods in the limbic system

b. inhalant--> dissolves fatty tissue in the brain

c. marijuana--> changes how the hippocampus processes sensations