One suggestion, based on my own experience. In about October 2007 I got nervous about the housing market bubble happening at the same time as the recession. So I pulled by IRA and 401K funds into strictly safe bonds and cash. And I stayed there until about April 2009, when I reinvested in growth and income funds. I made a killing of about $150K.

I'm currently in similar safe investments. I'm losing much of the current run up. But I sleep at night.