To do this crazy sleeping arrangement

Floor beds are exactly as comfortable as normal beds. It's a mattress on slats with an air gap underneath, there's just less leg. Doubles are dangerous if they fall out due to the height. But you've made up your mind that you want to do exactly what you planned and aren't interested in other options so I'm not sure why you're wasting everyone's time on this. 🤷‍♀️

I think it's a good idea overall, but I wouldn't put her on the bed until she is able to go up and down comfortably on her own. So it depends how mobile she is and whether she is already able to do that now.

She probably won't fall down sleeping with bed guards (or we found those long pillow type thing in Amazon that you put under the fitted sheets, much better IMO). But if she is anything like my kids, she will fall when she wakes up and launch herself go down.
I can see a huge difference in our DD between now (17 months) and a couple of months ago. She is completely fine getting down in her own now, and she naps in our bed.

I would put the noisy husband in the small room, the kids have the 2nd and 3rd rooms and the first is your room which you can allow your husband in as and when

Just get a toddler bed with a rail?

Buy the single bed with a bed guard for the single (can get bed guard cheap on marketplace).

Try it, if it doesn't work, you've got the single for you and double for her, if that's what you want to do.

^^ what @GlasgowGal82 says. Honestly I think you're bonkers to be considering her in your room and getting her used to that when there are many options available for a low bed for her in her own room. Ikea even does one that you can flip over when she's older so she has a cabin bed and a little play space underneath.

Yes! Forgot to say get the double,makes story time much easier,just get in too.

I sleep separately from OH. We spend a lot of time in each other's beds though.

I'd get a low down single bed and have her sleep in her own room. I would have suggested a bed guard, but it sounds like she's a bit young for that from some of the posts here, so you could use a pool noodle under a fitted sheet instead to try to keep her from rolling off. The Ikea Kura might be a good option because you can flip it over and use it as a cabin bed when she's a bit older. We've got something similar in our small bedroom, and it's still suitable for my youngest at almost eight years old.

If you put her in a double in your room there's a risk that becomes 'her room' in her mind, and you could struggle with the transition to get her back into her bed in a few years time. My youngest still rolls around all over the bed at almost eight so it might be something she doesn't grow out of quickly! The rails of his cabin bed keep him contained, but when he was in a cotbed he ended up on the floor most nights without waking himself up!

Is the question if it is crazy for a toddler to have a double bed when a parent would have a single? I'm gonna go with no.
But then again my dad's room was a single and kids room was a double and mine was a double

My DD was in a single bed at 8 months. Just put her in the bed! You can put some pillows down on the floor if you're worried about her falling out altho you'll be surprised that actually they learn pretty quickly not to fall out

Totally get you. Until ours were at least 2, they slept in our bed most of the time, because they liked the comfort of snuggling up. But we only had one bedroom, so the kids beds were in the same room anyway. Sometimes, we lifted them into their own bed once they were fast asleep, but realise this makes some kids wake up.

Whatever works best for you all, as we’re all different. Good luck.

Mine were climbers so went into a single bed with a bed guard when they were 12 months.

Sounds like she just needs her own bed.

@sleepingsecondhand you think a mattress on the floor is “not very nice” but you’re happy to let your child cry until she passes out with exhaustion?

We had a mattress under a single bed (I think it was on a trundle but it would be ok with just a normal mattress too) and would pull this out half way at night, so if this was a fall it would be a very soft one. Plus a bed guard.
At 15 months I'd just sleep with her before is try CIO, but if she would sleep in a bed on her own then it's worth a go. Watch she can't just get up herself, leave the room and go down stairs though.

Was it smell I wonder? Feeling soothed by the smell of a caregiver, even when they're not actually there?

I’d try a toddler bed for her first. Pop some pillows on the floor and what you’re likely to find is she’ll fall out the first couple of nights then get used to the space and won’t continue to fall out. Got to be worth a try first before you give up your double bed.

Second this! My 18 month old is in a double montessori floorbed and she sleeps through all night and loves getting herself in and out of it in the morning.

I don't think it's hugely unusual. My DC have had double beds since they were small. They're useful for multiple reasons.

I wouldn't as an adult give up my own double for a toddler though unless there was really no other option. Try her in the single first with a bed guard and maybe some cushions on the floor. Having had wiggly toddlers in doubles, singles and cot beds they don't seem any more or less likely to fall out of any of them.

She's 15 months - is she a physical 15 months like mine were (walking around, refusing buggies and high chairs, insisting on carrying lemonade bottles from the shopping (or any other heavy thing) etc.

If so, she'll be fine in a normal bed (like one with legs, rather than a high divan) - rug/carpet in case she does fall out.

At 15 months some babies are basically toddlers, and some are still definitely babies - where is she on that scale?