NAS100 - WHAT NOW?

NAS100 - What happens when the market goes to a place that you didm't think it would go? What happens when the charts say it may go higher? Do you go for it? Or do you just wait for a more reasonable direction from the market? NAS100 is at all-time highs. Can it go any higher in this climate? Should you believe your eyes or your feelings? You feel like 'One day it will all come crashing down. But the charts are telling a different story. What do you do?