Hubby nags at me to go to sleep because he hates that I fall asleep sometimes in mid sentance. I…

Hubby nags at me to go to sleep because he hates that I fall asleep sometimes in mid sentance. I can't help it some times and I sleep as often as I can but I also wan to get stuff done . And when I don't because I was home all day sleep he complains. Then also not only because I have three month old baby but two other kids home Thursday to Monday. So my sleep days are basically Monday thru Wednesday because I pick them up from school and drop them off at school and home with them all day on the weekends alone. Plus I stay awake until they go to sleep at night in the weekends and I'm not going to make them go to bed early because I'm tried. When they come here they have freedom. Funny thing is I make sure hubby gets as much sleep as possible because he has to work and his performance at work is important because he's a coach. I need him to understand I won't be able to sleep good for years. Our kids are 5, 3, and 3 months. The two are pretty independent but brothers fight and kids sometimes do things they shouldn't. I won't be okay to sleep good for at least another two years. Thats hoping I'm not pregnant by then. We planned on waiting two years, but I think I need more time. Or more help. Something needs to give.