Sandman and Sack time

Sandman noun - An elf in fairy stories who sprinkles sand in children's eyes to make them sleepy.

Sack time and sandman are semantically related in sleep topic. In some cases you can use "Sack time" instead a noun "Sandman", when it comes to topics like suspension of consciousness.

Sandman and sack time are semantically related in sleep topic. You can use "Sandman" instead a noun phrase "Sack time", if it concerns topics such as suspension of consciousness.