Asleep and Unwatchful

Asleep adjective - Being in a state of suspended consciousness.

Unwatchful and asleep are semantically related In some cases you can use "Unwatchful" instead the word "Asleep" as an adverb or an adjective.

Unwatchful adjective - Not alert to what is potentially dangerous.

Asleep and unwatchful are semantically related in unprepared topic. Sometimes you can use "Asleep" instead the word "Unwatchful" as an adjective or an adverb, if it concerns topics such as when not paying attention.