The market is at all time highs, a full 8 years into a bull market. So, if you’re starting to get nervous, you’re not alone. Now might be the time to bring some conservatism to ones’ portfolio. So, if you’re on the hunt for stocks that won’t keep you up at night, our contributors recommend Celgene Corp. (NASDAQ: CELG), Walt Disney Co (NYSE: DIS), and Valero Energy (NYSE: VLO). Read on to find out why.