What are your spiritual experiences with being slain in the spirit?

Hi, I am curious about believers' thoughts/experiences of being "slain in the spirit." Often seen as falling to the floor after having hands laid upon you and being overwhelmed with the spirit. I'm Looking for opinions, experience, and especially biblical evidence of this occurrence. I watched some experience it for the first time today at the church I attend. I'm wary of the biblical basis behind it. Appreciate all points of view, and judgment withheld.