Twilight
Twilight is the part of the day between the going down and rising of the sun. So generally, it's night time.
It is said to be the most beautiful of hours, and is also when most supernatural happening occur.
"Meet me by the lake at Twilight."

"We'll do the spell at Twilight."

"He kissed me under the stars at Twilight."

"I saw the boogie monster!" "When?" "At Twilight last night!"