Demand for Treasury bonds pushes prices up and yields lower. Given that Treasury yields are at all-time lows, the implication is that demand for these securities has increased. Many attribute this to buying by the Fed, but this demand is really being driven by retail investors. For contrarian investors, this would be an indicator to sell Treasuries, as retail investors are often referred to as "dumb money." See the article here, CNBC.
Dolvin, Steven D., ""Dumb Money" Pushing Treasuries" (2012). All Chapters. 15.