Cloud by day. Fire by night. What would it be like at the time of transition - the changing of day to night and night to day? I do not think that one would leave and the other one come. That would create a void. God does not like voids. So one must think that there would be an overlap of the two - a simultaneous presence of both. This could be a fearful time and not at all what one would be accustomed to during the day or during the night.
In the seasons of our lives when God is shifting us from the night season to the day season (or the other way around) it can seem like a confusing and conflicting time with much going on around us. We need to learn to not be shaken during these times, but trust that it is just a time of progressing from one state to another. If we allow ourselves to be shaken by this display of seeming opposites converging we may be tempted to retreat back into the season that God is calling us to leave. Keep pressing through. It will not always be this volatile. The transition will take you to the cloud or fire by itself, but there will always be a presence.