Eight Sleep
Sleep fitness company building temperature-regulating and sleep-tracking technology.
Who is building this.
Massimo Andreasi BassiCo-founder & CTOI build Eight Sleep’s technology as co-founder and CTO, turning thermoregulation, sensors, and data into sleep products for recovery and health. Eight Sleep is a YC Summer 2015 company founded in 2014 and recognized by TIME and Fast Company. Before Eight Sleep, I founded Staq.io, which PlayHaven acquired in 2013.
Alexandra ZatarainCo-founder & VP Brand & MarketingI build Eight Sleep’s brand and marketing around sleep fitness, using temperature-regulating and biometric technology to make sleep measurable and adjustable. I co-founded the company in 2014, helped take it through Y Combinator and a $1.8M preorder campaign, and was named to Forbes 30 Under 30 in Consumer Technology.
Cumulative raised across 7 rounds, totaling $301M.
Fundraising history.
Seed — $6M
Mar 2016Eight announced a $6M seed round after early crowdfunding and pre-orders.
Investors: Y Combinator, Yunqi Partners, Azure Capital, Cota Capital +5
Source ↗Series A — $5M
Jan 2017Eight announced an additional $5M round, bringing total funding to $11M.
Investors: Yunqi Partners, Azure Capital, Y Combinator, Stanford StartX Fund +2
Source ↗Series B — $14M
Mar 2018Eight Sleep announced a $14M Series B led by Khosla Ventures.
Led by Khosla Ventures · with Y Combinator, Yunqi Partners
Source ↗Series C — $86M
Aug 2021$500M post-money
Eight Sleep raised an $86M Series C led by Valor Equity Partners; TechCrunch later reported the round valued the company near $500M post-money.
Led by Valor Equity Partners · with SoftBank, Khosla Ventures, Founders Fund, General Catalyst +7
Source ↗Series D — $100M
Aug 2025Eight Sleep raised $100M in Series D funding to expand AI sleep technology and medical applications.
Investors: HSG, Valor Equity Partners, Atreides, Founders Fund +3
Source ↗Strategic — $50M
Mar 2026$1.5B
Eight Sleep raised a $50M strategic round led by Tether Investments at a reported $1.5B valuation.
Led by Tether Investments
Source ↗Growth — $40M
Nov 2019Eight Sleep closed $40M in new funding led by Founders Fund.
Led by Founders Fund · with Khosla Ventures, Y Combinator, Craft Ventures, 8VC +3
Source ↗
Invested in Eight Sleep.
Babak NiviInvested in Eight SleepBabak Nivi is a startup founder and angel investor best known as a co-founder of AngelList and Venture Hacks. He has also been described publicly as an early investor in Uber and an advisor to Dropbox.Y CombinatorInvestorSeed, Series A, Series B +2 rounds
- Yunqi PartnersInvestorSeed, Series A, Series B participant
Sleep fitness company building temperature-regulating and sleep-tracking technology.
Sleep fitness company building temperature-regulating and sleep-tracking technology.
Press
eightsleep.comEight Sleep | The Intelligent Bed Cooling SystemFall asleep faster and stay asleep longer with personalized cooling and heating for each side of the bed. The Pod reduces snoring, tracks your sleep, and works with any mattress. Try it risk-free for 30 nights.
linkedinEight Sleep | LinkedInEight Sleep | 41,979 followers on LinkedIn. The sleep fitness company. | Eight Sleep is the world’s first sleep fitness company. Our mission is to fuel human potential through optimal sleep. We use innovative technology, detailed design, and proven science and data to personalize and improve each night for everybody—changing the way people sleep forever and for the better.
ycombinatorEight Sleep: The sleep fitness company. | Y CombinatorThe sleep fitness company. Founded in 2014 by Massimo Andreasi Bassi, Matteo Franceschetti, and Alexandra Zatarain, Eight Sleep has 100 employees based in New York, NY, USA. Eight Sleep is hiring for 13 roles in product, recruiting & hr, engineering, and operations.
PRNewswireEight Announces $6 Million Seed Round To Change The Future Of Sleep/PRNewswire/ -- Eight (www.eightsleep.com) the technology company changing the future of sleep (formerly known as Luna) — today announced it has closed $6...
eightsleep.comOur (continued) commitment to healthier livesIn 2014 we founded this company with a mission to use technology to improve sleep. Fast forward 4 years and with 2.
eightsleep.comNew Funding to Scale The Sleep Fitness MovementI am thrilled to announce Eight Sleep has raised $86M in Series C funding led by Valor Equity Partners, with participation from other funds including SoftBank, Khosla Ventures, Founders Fund, and General Catalyst. This is just day one Eight Sleep was founded with the mission of fueling human potential through optimal sleep.
TechCrunchEight Sleep raises $86M as its smart mattress and 'sleep fitness' technology approaches $500M valuation | TechCrunchThe venture world is -- quite literally -- waking up to the potential of applying artificial intelligence to a wider variety of real-world,
TechCrunchEight Sleep raises $100M to expand its AI-powered sleep tech | TechCrunchThe sleep tech company raised from HSG, Valor Equity Partners, Founders Fund, Y Combinator, and big F1 names like Charles Leclerc and Zak Brown.
TechCrunchEight Sleep raises $50M at $1.5B valuation | TechCrunchEight Sleep said it was free-cash-flow positive in 2025 and plans to use the new funding for new products, global expansions, and clinical validation.
tether.ioTether Makes Strategic Investment in Eight Sleep at $1.5B to Accelerate Sustainable Health Intelligence - Tether.io4 March 2026 – Tether Investments today announced a strategic investment at a $1.5B valuation in Eight Sleep, the world’s renowned sleep technology company that applies advanced artificial intelligence and embedded sensors to deliver personalized sleep insights and enhancements. Tether firmly believes in the growing importance of health tech as a foundation for longevity, performance, […]
eightsleep.comWhy Eight Sleep | Backed by Science, Built for PerformanceDiscover how Eight Sleep helps you sleep deeper and recover faster with the same tech trusted by elite performers. Learn why our Pod is clinically proven to improve sleep.
eightsleep.comNew Funding, New OpportunitiesThis year has been nothing short of phenomenal at Eight Sleep! I am thrilled to share that we recently closed $40 Million in new funding led by Founders Fund with the ongoing support of Khosla Ventures, Y Combinator, and new investors Craft Ventures, 8VC, Ryan Petersen, Kevin Hartz, and Jason Calacanis. This round comes on […] .
PRNewswireEight Closes Series A Funding/PRNewswire/ -- Eight (www.eightsleep.com), the technology company focused on improving the way we sleep, today announced that it has closed an additional $5M...
axios.comEight Sleep raises $100 million, preps retail storesSupports 2025 $100M Series D, investor list, FDA application plans, retail-store plans, and Asia expansion plans.
wsgr.comFirm Advises Eight Sleep on IP Matters Related to $100 Million FinancingSupports 2025 $100M financing, participants including HSG, Valor, Atreides, Founders Fund, Y Combinator, Charles Leclerc, and Zak Brown, and intended use for Sleep Agent and medical applications.
businesswire.comEight Sleep Raises $86M Series C to Scale Sleep Fitness MovementSupports the 2021 Series C, company description, named investors, and revenue growth claims at that time.
businesswire.comEight Sleep Secures $100 Million to Accelerate AI‑Powered Sleep Optimization, Expand Into Medical, and Grow Global FootprintSupports the 2025 $100M financing, participants, $500M+ Pod sales, 10x revenue growth since Pod launch, 1B+ hours of sleep data, and 30+ country footprint.