Cryosleep
Most people who underwent cryosleep have reported that the mind seems to naturally retreat into a place of infinite tranquility, where the experience of Time itself is distorted in a subtle way.
Although there is no trace of conscious activity in the brain of sleepers, it appears that Experience itself never ceases, creating atemporals bubbles of memories of transcendental calm when the subject awakes.
It may be possible that chemicals used in the cryosleep process alter the outer cortex in a way that is not yet understood, however we believe cryosleep is a perfectly safe means of interstellar travel.
Quotes from space travellers.
… and then and when your infinite tranquility may be interrupted by a colourful flash from one of those high-energy cosmic rays blasting through your brain.
That’s a risk, of course … but would you notice it? Or maybe those rays are the cause of those atemporal bubbles? So many questions, so little time.