Recent Breach Targeted MyPillow And Amerisleep Customer Data If you've purchased bedding from either MyPillow or Amerisleep, your data may have been compromised. These companies are two popular mattress and bedding merchants operating in the US. This is according to a recent report coming to us from RiskIQ. The hacking group Magecart appears to be behind both breaches, which is bad news for both companies and their customers.