What is cryosleep?

Cryosleep, also called suspended animation or stasis in science fiction, refers to a state where a person is placed into deep sleep or hibernation for extended periods — often decades or centuries — without aging, deteriorating, or dying.

In stories, astronauts use cryosleep to travel across galaxies, or characters are preserved until a cure is found for their illness. While these ideas are fictional for now, the underlying question is real: Can humans be put into a low-activity state for long periods and brought back?

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Cryosleep vs. cryopreservation: not the same

Cryosleep implies that a person is still alive — just deeply unconscious — and can be reawakened easily. But this isn’t possible with current science.

Instead, what exists today is cryopreservation: preserving the body after legal death using vitrification — turning bodily fluids into a glass-like state to prevent decay and preserve the brain’s structure.

In other words:

• Cryosleep = reversible sleep without death (not yet real)
• Cryopreservation = non-reversible preservation after death with the hope of future revival

At Tomorrow.bio, we don’t offer cryosleep. We offer real-world cryopreservation — and we’re honest about what’s possible.

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What would it take to make cryosleep real?

To create reversible cryosleep, science would need to overcome major challenges:

• Safely lowering metabolism without damage
• Maintaining brain and organ integrity
• Preventing infections, clotting, or cellular collapse
• Waking the person with full cognitive function intact

Some animals, like bears or Arctic squirrels, can hibernate naturally, slowing their metabolism for months. Scientists are studying them for clues about inducing hibernation in humans, especially for critical care or long-duration spaceflight.

But right now, true human cryosleep doesn’t exist.

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What’s the point of cryopreservation?

Cryopreservation is based on a simple question: If future technology could reverse the cause of your death, would you want to be there to benefit?

It’s not about immortality or fantasy. It’s about:

• Preserving choice when medicine can’t help anymore
• Keeping identity and brain structure intact
• Investing in the hope that science keeps advancing

Cryopreservation doesn’t require you to believe revival is guaranteed — only that you’d rather preserve the chance than lose it forever.

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Is anyone trying to develop cryosleep?

Yes — research is happening in parallel areas, especially for space travel and emergency medicine.

• NASA is studying torpor induction to reduce astronaut needs during long missions
• Medical researchers are experimenting with therapeutic hypothermia, lowering body temperature after cardiac arrest to slow brain damage
• Animal studies are exploring how certain genes enable hibernation

These are early steps — but they show growing interest in slowing metabolism and protecting the body in extreme situations.

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Will cryosleep ever be possible?

It’s impossible to say. But if scientists do crack the code for reversible metabolic suspension, it could revolutionize:

• Emergency trauma care
• Space exploration
• Terminal illness treatment
• Aging and disease research

Until then, cryopreservation is the best scientific method for preserving a body and brain when medicine fails.

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What about pets?

Tomorrow.bio also offers pet cryopreservation, applying the same science to beloved animal companions. You can use our pet calculator to explore pricing and options.

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Cryosleep may be fantasy — but the science is real

While cryosleep isn’t yet possible, cryopreservation offers a real-world alternative that honors many of the same hopes: continuity, potential revival, and the ability to experience a future that current medicine can’t deliver.

If that future arrives, it will be because people chose to invest in possibility — not because they waited for fiction to become fact.

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About Tomorrow.bio

At Tomorrow.bio, we are dedicated to advancing the science of cryopreservation with the goal of giving people and pets a second chance at life. As Europe’s leading cryopreservation provider, we focus on rapid, high-quality standby, stabilization, and storage of terminal patients — preserving them until future medical technologies may allow revival and treatment.

Our mission is to make cryopreservation a reliable and accessible option for everyone. We believe that no life — human or animal — should end because current medical capabilities fall short.

📧 Contact us at: hello@tomorrow.bio
🌐 Visit our website: www.tomorrow.bio
🤝 Schedule a consultation: Book a call

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