Conk out and Go to sleep

Conk out verb - To lose consciousness.

Go to sleep and conk out are semantically related In some cases you can use "Go to sleep" instead a verb "Conk out".

Go to sleep verb - Prepare for sleep.

Conk out and go to sleep are semantically related in drop off topic. Sometimes you can use "Conk out" instead a verb phrase "Go to sleep". informal substitute