Single Attachment Parenting to More than one Child??

Hi..
I tend to practice attachment parenting. I've never really thought about styles or anything I just always did what came natural and what worked. I did this with my daughter until she turned 3 and became more independent. I still respond to her needs.. but I had my 2nd child when she was 2 and she really grasped the big sister role. So now she's 4 and my 2nd child.. he's 2... and I have a 4 month old boy now too. I'm newly single.. somewhat. My husband took off when I was about 34 weeks pregnant and he's been gone since. So it's been 5 months... maybe a little longer. Anyway... my 2 year old has tantrums at night... when he does it startles my baby. How do I respond to them both at once?? It isn't that my 2 year old wants me.. it's that he still wants to play instead of go to sleep. I have ended up letting him cry-it-out before... but I don't know what else to do. His sister has to go to school so I can't let him have his way.. it'll wake her up... How do you practice AP with more than one child.. all on your own?? I love all my children.. but sometimes feel like I'm not doing enough. Especially for my older daughter... though I do try...