This morning I obviously forgot it.But when I saw my fingernail,suddenly associate with the sound of fingernail scratched TV,as if it happened once.

• 早晨起床；明显已经忘记了这件事情；但是当自己看到自己的手指甲就突然联想起半夜刺耳的声音；好象确实发生过这一件事情.