The Bucket Plan, an excellent how to book by Jason L. Smith describes a simple and effective system to allay the fears of retiree investors, by ensuring that they will have enough cash for their needs, and avoiding the need to sell investments when markets tank.
In February 2018 Vanguard Canada launched all-in-one complete Balanced Portfolios that you can purchase by entering one ticker symbol.
the "Buffett Indicator". This is essentially the ratio of the total value of the US stock market to the US Gross Domestic Product (GDP). At the moment, the ratio of 151% is close to historic levels.
Ignoring market headlines isn't putting your head in the sand; it's a key to a basic investing tenet.