Getting Them to Go to Bed!!!

If they have their own rooms, I think you should start putting them to bed there. If they come out, calmly but without interaction take them back to bed. You may have to do this over and over for the first few nights but eventually when they realize that you are NOT getting upset and you are NOT going to play or lay down with them, they will go to sleep. As far as the baby now is a great time to introduce a bedtime routine. You can use the same routine for all 3 kids if you want--that would be even easier on you. If you get them into a better nighttime routine that will probably help with the 2-year-old's late nap, too--he might be tired earlier and that nap can shift to earlier in the day. Good luck--it is tough being sleep deprived!

So they all sleep together in the same room?
That can be challenging.
Room dividers between beds to give the effect of separate bedrooms.
Can 9 month old sleep in your room?
Do they have a bedtime routine? Wind down time, bath, possibly read a book etc.

Is this post serious??? You should not be a parent if you feel you cannot get your children to the normal things that all children do. Your kids need to be in bed by 7:30-8:00 at that age. Your children need early intervention services if they are just starting to talk. You need much more then a few moms who tell you,
"it's ok"
IT'S NOT!
Get tough and start being the parent these children deserve. No boundaries=disaster.

oooohhh this is a GREAT question!!!

EVERY family is different. In our home - there is NO ELECTRONICS whatsoever 30 minutes prior to bed time.

We have the same routine - bath (shower), brush (hair and teeth), book, Bible (prayers) and bed. They are allowed to get out of bed for the bathroom or a drink of water...they can come to me if they have a problem (nightmare, etc.) but overall - once they are in bed - they are in bed...

I would NOT allow my child to nap at 430 in the afternoon - that's WWWWAAAYYY too late in my opinion. Yes, it makes for a rough evening but really - WWWAAAYYY to late - hence why they are staying up until midnight..

I would NOT lay with them anymore...if they ask why - simply state - I'm here to help you go to sleep - you are not sleeping therefore, I am not here. If they don't like it - well, then they need to lay down and go to sleep.

I would also watch their diet - caffeine loaded items (you'd be surprised what has caffeine in it), sugar, dyes/food colorings in things, etc....we did some changes in our diets that helped mellow our kids out.

I would not give my child melatonin at that age...i hear that some parents do - but to me - that's far to young to give "natural" drugs to.

make sure bedtime is the same every night. consistent and true. I know it's hard...what does daddy do to help out?

GOOD LUCK!!!

Something that always worked with my kids is a threat. Not the yelling screaming mean kind of threat, but the "natural consequences" kind:

"If you continue to get up instead of lying down quietly, then I will leave the room and you can go to sleep without me in here." And then, if they continue to get up, then you leave. They will learn pretty quickly, assuming that they WANT you in there with them.

ETA: after your added: So maybe that is part of the issue then... It is proven that if you do other activities in your bedroom it can be more difficult to fall asleep. Look up some articles on insomnia... you'll see what I mean. And that is what is happening... you are trying to put your kids to bed in their "play" room. Is there a reason you have chosen to put them to sleep on a pallet in the family room instead of a bedroom?

How are their rooms/beds arranged? Can you give us more details to give us a better idea of your setup & bedtime routine (if any)?

Everyone has given great advice so far, but I want to mention morning time as well. You did not say in your post what time your kids get out of bed. Since they go to bed so late, I can't see them being early risers. Maybe you should start waking them up a little earlier each day. They will eventually get tired at an earlier time. Your 2 year old will start to want a nap earlier too. Now if the kids are getting up at 5 am, sorry I don't know what to say.

I am with Shari S. 100%!!!!

to add my own, WHAT IN THE WORLD IS YOUR PROBLEM LADY??? there is something seriously wrong with your children if they arent talking, and if they truly dont "understand language". I also read your answer about toddler eating and the fact that your 2 year old is still eating baby food and drinking from a bottle just because you are too lazy to work with them, wow that is terrible. and you said you are a terrible mom with too many babies, you only have 1 baby and 2 toddlers. and you just said here being a mom is natural to you, why in the world do you continue to keep having children?
you need to get your kids help, stop acting like their 10 year old babysitter and grow the hell up. maybe you should just give them to someone who will actually raise them and care enough to get them help, if they arent talking that is a huge red flag.

Do you have any kind of bedtime routine?My son was fussing about having is his bath. I don't think he adjusts to change well, so we've watch Sprout after dinner, this way he has a visual reminder. .Once the nerdle durdle (or whatever it's called) comes on I start talking about it's almost bath time. Then after pajanimals, I tell him it's bath time. The tv goes off and he takes his bath without a fuss. I dim the lights in his room and we read books. He knows when we are done reading books it's time to get into bed.I don't know if this will help you since I only have one, but it's worth a try.