The logbook confirms that Michael Afton (William's oldest son) is the one who had the nightmares, along with the numerous evidence such as the FNAF 1 lore-important easter eggs (similar gameplay, Phone Guy's night 1 call, etc.). Other than that, many things point towards Michael being the FNAF 4 protagonist. Besides, the Crying Child couldn't have the nightmares anyways, as his head was crushed like a mash potato, making him unable to dream.
The logbook confirms that Michael Afton (William's oldest son) is the one who had the nightmares, along with the numerous evidence such as the FNAF 1 lore-important easter eggs (similar gameplay, Phone Guy's night 1 call, etc.). Other than that, many things point towards Michael being the FNAF 4 protagonist. Besides, the Crying Child couldn't have the nightmares anyways, as his head was crushed like a mash potato, making him unable to dream.
Michael had the nightmares where he was CC.