Each time he went to bed and turned off the lights of his stateroom, he did not actually fall asleep.
Not completely, at the very least.
The only part of himself that truly fell into a slumber was his meat avatar. Its physiological structure and functions were authentically human, if augmented to a high degree.
Ever since he made use of this human avatar, he made sure to maintain it and keep it up to date.
He paid close attention to the nutritional intake of the meat avatar.
He brought his meat avatar to the infirmary to conduct its routine maintenance inspection.
He allocated a proportion of the credits and merits he earned on replacing or updating its intricate augmentations.
It was quite tiring to maintain this carefully-sculpted sack of flesh and bone. There were many periods of time where he wanted to get rid of this confining burden and interact with the cosmos in a more direct fashion, but that was impossible.