Girls, hi! From what age does a child realize that it's dangerous for …

Girls, hi! From what age does a child realize that it's dangerous for them to slide off the sofa or bed? We are 8 months old, we climb on the floor all the time not understanding that they will fall. Naturally, we hold them back. My sleep is sensitive, but I am afraid that I will suddenly fall asleep and she will fall. Through a baby gate, she already fell onto the bed softly and without crying. Or how do you teach the little girl?