"Gwelodd e'r ceffyl echnos."

Translation: He saw the horse the night before yesterday.

[ag3n7_z3r0]

I wrote night before yesterday (no article) even though it's not natural English because it's what the hint says.

[HBee10]

yeah same here, maybe night before last would be better

[NoelGoetowski]

Did you mean to say he had a nightmare?