What is this sleep people speak of?

Now before i start i will tell you i do have some medical issues involving sleeping but i will go in to that some other time.  So my 9 month old has always had a hard time sleeping, i have not had a full night sleep  since my last couple months of my pregnancy.  He started out as a normal up every 3 hours to eat, then we were up a couple times a night, and then about  EVERY hour to two hours.  Around 6 months he was officially diagnosed with reflux and was put on meds (we waited that long to see if he would grow out of it and did not) then we had to work on getting him in to a "normal" routine and it has been hard because i think by that point he was use to being up all night.  So now here we are 9 months old and yes he has had some great nights but when he is sleeping good my 6 year old gets up for some reason or another, so if it is not him it is her and i officially think i'm a sleep deprived zombie. It does not help that i am already always tired due to a medical issue and i can not explain it but losing as much sleep as i do it makes me feel even worse and deep down i know getting a full nights sleep will not make one bit of difference in how i feel which kind of sucks but it feels like my meds do not help when i don't get sleep at night.  My sofa has become my best friend most nights, it was the only way i could sleep when i was at the end of my pregnancy (my mattress is hard as a rock and hurt to much) and now since i am up so much i do not want to wake my husband who does have to go to work in the morning even though his insist it does not bother him when i get up as much as i do with the kids, but if he cant work because he did not get any sleep then i feel bad so i just sleep out there any ways when i know its going to be a long night.  Then you get people who say " well why don't you sleep when he sleeps during the day?" well as hard as it is for me to not sleep if i do NOTHING will get done, it is the only time i can actually get thing sone around the house when he takes a nap, believe it or not us stay at home moms don't just sit and watch tv all day and do nothing.  Well that is all for now. I made some bakes kale chips that i am going to snack on before i go lay down.  Have a great night!