νυστάζω/nustazō

This word describes a situation or how something is. It is a verb. However, it is not an action.

This word can mean to fall asleep or begin to sleep. It is used to talk about the situation in which a person is no longer awake but is not yet completely asleep.
This word can mean to do something that is like being asleep. When used this way, this word is used to talk about something that is slow to start doing something or that does not start doing something.

See: Matthew 25:5; 2 Peter 2:3