My great-grandma swore on something similar. She said she was sure her son (my great uncle) had come to visit her when she was sleeping but she didn't like it because part of his head was caved in.
Week later she found out he'd been killed in a military accident in Germany, the troop transport he'd been travelling in had over turned.
The driver was drunk so the army hadn't released details straight away but it had happened on the night she'd had the dream.
She'd told multiple people about it before the family got the news. Took another month to get his body back. When they did they couldn't have an open casket due to the decomposition and damage from the accident. Broke her heart.
