I know it's doable for plenty of people - like all of you. I'm wondering if it's do-able for me. I love my sleep - love it. When I don't get enough sleep I get physically ill and a few times since my 8 month old has been born I've vomitted due to lack of sleep (normally it's nausea and a stuffy nose). My 8 month old is not a fantastic sleeper but we work hard with her on it and she can sleep through the night about - say - 40-50% of the time and I expect/hope that number will climb. She doesn't nap too terribly much but since she has a bedtime on the early side I have household maintenance at least roughly done each week while I work 20 hours. Most of all I'm just not a terribly emotionally resiliant person. I'd love to get better at it, but I'm a worry wart and some days little things just throw me for a loop.
We'd love our kids to be close together, but I worry that the lack of sleep might drive me insane and trying to figure out how to get stuff done with 2 little ones who need a lot of attention will be impossible.