I know from experience that raw wood definitely bends and warps when in contact with moisture.
I am actually wanting to purchase the single version of same bed frame but from the picture here, it doesn't appear to have any finger joints: https://ibb.co/Z8YRmH5
I guess I'll just have to open it and check when I get home, as they only had the queen bed on display at the store.
I also just received an email from a company that builds wood products. I sent them the same picture and this is their reply:
"The images of the bed are not clear enough to see detail but in the image that shows the end timber on the base, the timber appears to be laminated. If it is, we suspect that it may be constructed with glue using Formaldehyde as we understand that this is commonly used in the process of heat pressing and laminating timber.
However, we do not know where IKEA sources itís timber from, how it is manufactured nor what their standards are so it is best if you can check with IKEA.
We mainly work with recycled timber that is solid so our experience with composite timbers is limited.
We hope this may be of some help to you".
Does it sound truthful, as I would imagine wood glue, would be a cheaper option than Urea Formaldehyde, given the likelihood of skimping cost.