[WhiteWarrior]

It sounds like you have a beginning mediumship talent. Yes, it can be controlled. Mediums strong enough to get spirits poking through regularly learn how to close and open the gate or portal within them. This is a mental exercise and can be done in numerous ways of your choice.

These things happen when you are slowing down. Falling asleep or drowsing. That's when your mind gets quiet enough for spirits to be able to get through. You need a simple rite to 'close the door' before you lay down, like visualizing a safe door clanging shut and locking it, with the spirit world on the other side and you on this side. If this isn't working sufficiently you can add to it, with simple things like saying "In my own name Laurel I close my gate for this sleep. So be it." Alternatively, your particular religion probably has a prayer that covers such things if you look closely.