Before baby make his appearance this summer, I would like our girls to get used to sharing a room. Currently our oldest daughter sleeps in a full-sized bed in her own room and our younger daughter sleeps in a crib in the nursery. So little sissy is going to have to move out of the nursery and in with her big sister. Our oldest will be 4 years this month and our youngest will be close to 2 years when we make the transition. Any moms have experience with their children sharing a full-size bed? That would be the easiest and cheapest option to just have them sleep together. But, they are both very active sleepers and move around a lot so I wasn’t sure if they would sleep better if we got them separate twin beds? Space isn’t really an issue so I’m not considering bunk beds, with a 2-year old that just makes me nervous! Would they just get used to sleeping together in the same bed? Any thoughts or insights? Thanks! 
My girls share a room but have separate beds. I did have my eldest in a queen bed from about 20 months till when she had to share with her sister at around three. I considered keeping the queen bed too and having them share but decided against it for lots of reasons. I thought it would be safer in seperate beds and I also wanted them to have some space. They have to share a room so thought they could do with their own sleeping spaces. When we go away to visit family or on holiday they often have to share a big bed, it works out ok, but is not ideal for sleep in my opinion. It is very hard to keep blankets on one child let alone two in a bed. They wake each other when they role over. They wake up very early too! We have to seperate them for the getting to sleep bit (one in our bed) then move them together. Otherwise they are just crazy banshees in there winding each other up. Ultimately I think it can work fine if you have to do it but I figured that my girls have to share so much that giving them some space to sleep was better for everyone. [name_f]Hope[/name_f] that helps a little.
I’d say get each girl her own bed. They may end up in the same bed every night, but at least they’ll have the option. And if they are wild sleepers, they will sleep better.
If space is not an issue, just keep the full bed and add a twin. If you don’t want to sacrifice the floor space, maybe a trundle bed?
Not a mama berry, but I’d have to vote for them each having their own bed too. My younger sisters and I have had to share beds at various stages of our lives, and it didn’t always work out. My youngest sister kicks like crazy, plus rolls. My younger sister talks in her sleep and hogs the bed and blankets. I have insomnia (so I tend to risk keeping my bedmate up at night), I have a crazy leg twitch when I stretch, and I have weird sleeping positions because of pain in my hips and knees. As soon as we have the choice, we opt for separate beds. It’s not the worst option in the world to have them share a bed, but if they don’t absolutely have to, then I think separate beds would work well.
Thanks so much for all the input so far! I am leaning towards separate beds for all the reasons you all have mentioned. And thanks tarynkay, I did think about keeping the full and adding a twin. It is a large room, but we’ll have to see if a full and twin would work well. Thanks again, more input is welcome! 
Our oldest two have twin beds from [name_f]Ikea[/name_f] that have amazing storage underneath. I think they’re the FLAXA type. [name_u]Truly[/name_u] awesome for throwing lego creations into the drawers and putting away the mess.
When I was young (after my crib days / parents’ bed/s days) sister and I had sep. twin beds, shared one bed for a while, than shared bunk beds, then got our own beds again, and then new ones because we’d had the same separate beds for a long time. You should ask the girls what they want, it would probably be the best way to make a decision. I, personally, had no say, lol…
I would ask your oldest what she wants to do since you wouldn’t have to buy anything new if they share you could try it out and see how it goes before making a final decision. I have a boy and a girl who share a room and have separate beds but they still sometimes like to share a (twin) bed together. My concern with sharing would be if one child was sick or for getting out of bed at night. You wouldn’t want the two year old to be able to roll out but you also wouldn’t want them to have no away out. Also for our kids we have a rule that their beds are special so they need to get each other’s permission before climbing into them. It’s also where they keep the toys they sleep with at night that are their most special toys. My daughter tends to wake up earlier then my son most morning and will come into our room without waking him up. I would think if they were sharing both kids would wake up at the same time.