Adam was caused to fall into a deep sleep for two reasons:
- The "deep sleep" was a form of anaesthetic so that, as his rib was removed, he would not feel the pain of the "operation".
- It also pointed forward to the work of the Lord Jesus Christ. He had to enter the "deep sleep" of death so that his bride, the church, could be created. When he awoke, he and his bride were joined together to live in the garden of Eden. Just so, Jesus having been raised from the dead, will, one day soon, be joined to his church when he returns to establish his Father's kingdon on this earth. Then Eden will be restored and all the earth will be filled with God's glory. (Numbers 14:21).
I hope you have found this helpful.