How much sleep so you need while pregnant??

Hey does anyone know, cause I'm curious and a bit worried, how much sleep so you need when you're pregnant? With my first pregnancy I was able to sleep all I wanted. Now, I just found out I am pregnant, I have a 9 month old who refuses to sleep through the night. Some nights I'm worried I didn't even get REM sleep. I know it's best for me to get a good night sleep, but what about my unborn baby? Can it be damaging to their health and development if I don't get a good night sleep? My husband has tried to get up with our daughter but every single time it ends with me having to breastfeed her. Please let me know what you think, especially if you've had experience in this department!