Can a girl get some sleep?!

OK, so I know they say you don't get much sleep after kids, but it has been almost 3.5 years and I still can't rely on a good night's sleep. That is all I want in life. To go to bed every night and sleep for 8 straight hours. No interuptions, no crying babies, no toddlers standing next to my head saying, "I want to watch TV" at 3am, no husbands talking in their sleep, no bad dreams, nothing. I want to fall asleep into deep, black, obliviousness and wake up exactly 8 hours later feeling like a human being. Is that so much to ask?