How to use "nightmare" in a sentence

I realise that my nightmare has lasted for exactly 127 hours

Bur there is one strange experience that stays in my mind like a nightmare.

The scene in the little room was from a nightmare

Later, after no more than two dreamless hours, she suffered another nightmare about Danny

She thought of the man in her nightmare, the man in black whose face had been lumpy with maggots, and the shadows in the corner of her office seemed darker and deeper than they had been a moment ago.

Even though he was only a creature from a nightmare, and even though it was utterly impossible for him to be here in the flesh, she couldn't shake the heart-clenching feeling that he was in the room

He was only a nightmare monster

She sat straight up, the sheets knotted in her fists, catapulted out of a nightmare

Crazily, Tina felt as if her nightmare had not come from within her, but from without, as if some person or force had projected the dream into her mind in an effort to-

Taking in her broad smile, he said, "Obviously, it wasn't the nightmare."