Eight 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.

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Eight Sleep has raised $50 million in a strategic round led by Tether Investments, valuing the sleep tech company at $1.5 billion. The company, which sells smart mattress accessories with sleep tracking and temperature control, reported being free-cash-flow positive in 2025. It plans to use the funds for new products, global expansion to more of its 34+ country markets, and clinical validation. Eight Sleep is also pursuing FDA approval for sleep apnea detection and developing a sleep-focused AI agent that proactively controls temperature, elevation, and firmness. The company has raised over $310 million in total funding.

Eight Sleep raises $50M at $1.5B valuation

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