My cat keeps bringing her kittens onto my bed, what do I do?

So my cat had kittens 25 days ago, they were originally staying under my desk in a tray with a blanket, but a few days ago my cat brought the kittens up on to the bed. I’ve tried to move them back multiple times as I’m scared I might roll over in my sleep but each time she brings them right back. I’m unsure of what to do as I don’t want to cause her or the kittens any stress. Does anyone know why she is doing this or what I can do to keep kitties safe? TIA and pic for tax🥰