Hi
« I didn't sleep enough last night »
« one hour was not enough earlier »
The second part ("one hour") refers to a nap IMO.
The judicial report CVR transcript shows 2" between the 2 sentences, it even write them on 2 separate lines in the transcript.
Thank you for having specified this.
A nap? why not.
Therefore, beacause both sentences are separated, maybe it is possible to think that « one hour was not enough earlier » made reference to the interval of time to get ready (eyes wide open) between the alarm clock ring and the shuttle departure?
We can speculate all we like, we still won't know.