It means physically sharing a bed for sleep or rest, not necessarily sexual.

Literal Sharing

Indicates a temporary situation which is not permanent, like during a sleepover.

Temporariness

The word can be used without emotional undertones, just describing the situation.

Used to express surprise when two things or people are connected, especially if they're normally not.

Highlights a relationship between concepts, not physical entities.

Used in idioms or sayings to convey ideas that aren't literal but have a metaphorical meaning.