SoftBank has invested in a series C round for the smart mattress producer, which also counts Comcast as an existing investor.

US-based smart mattress producer Eight Sleep has closed an $86m series C round featuring internet and telecommunications group SoftBank.

Investment firm Valor Equity Partners led the round, which included venture capital firms Khosla Ventures, Founders Fund and General Catalyst. It increased Eight Sleep’s valuation to nearly $500m, the company confirmed to TechCrunch.

Founded in 2014, Eight Sleep sells a range of smart mattresses that can monitor data about users’ sleeping patterns as well as temperature and environment preferences. Its products…