Investing at market highs can be nerve-wracking, but history shows that staying in the market, even at all-time highs, has been rewarding. Technical analysis suggests that a new market high often indicates future upside potential. Consistent investing, regardless of market conditions, is advised for long-term success, rather than trying to time the market based on emotion.

Read more at Yahoo Finance: How (and Why) To Stay in the Market Even at All-Time Highs