What does sleep mean and its synonyms?

Explanation of sleep synonyms usage

1. sleep is an adjective as well as a predicative adjective, which can only be used as a predicative, meaning: asleep; Sleep soundly (1) as a predicative. come

For example, the baby is fast asleep upstairs. The baby slept soundly upstairs.

I waited until they were all asleep. I waited until they fell asleep.

(2) as an object complement. For example, the police found him asleep in the garage.

Sleep is an adjective, which means that sleep is not necessarily used as a slogan, but as an attribute. It is also a gerund.

fell asleep