It’s my first day back from vacation, and I’m thinking I should take time off more often. Not only did we get some great posts here from my colleagues (thank you, all!), but my absence apparently allowed markets to hit new all-time highs. With investors getting excited, many expect the run-up to continue, despite the fact that I am now, metaphorically, back in the office. Sentiment is increasingly positive, and the fear of missing out is becoming a powerful driver for nervous investors to get back in the market. But should they?