Such a causal phrase

To one it can mean nothing

To another it can mean the world

It can mean have a good night's rest

It can mean leave me alone

It can be sweet

It can be harmful

It is not the word it is the speaker

We do not think

We act

We don't think others have feelings

We feel only for ourselves

Even then we disregard ourselves

Goodnight can make someone's day

Goodnight can break someone's heart

Goodnight is a word with meaning

It can be a day

It can be forever

Goodnight my friend

Goodnight my hater

Goodnight my lover

Goodnight all

Goodnight