Another thing I like doing is to try and get a feel of sentiment. For me, that's usually comments on forums or even Twitter. It's not quantifiable, but worked tremendously well during the range bound mild bear market over the last few years.
Invariably, the crowd seemed to get very bearish after some down. And very bullish after some up.
When that happens I get increased confidence we'll actually move the other way, so if I get technical signals that oppose the crowd I'm feeling very confident trading those. I've seen a lot of bearish sentiment lately, so that helped me push the long side lately.
Saw the same thing when the markets bottomed last fall. Even if people weren't expecting a crash, there were a lot of comments like, "This market HAS to pullback here. This is crazy."
Convinced me that this might just continue ripping instead. And I also looked up similar price sequences and saw that it wasn't like it hadn't happened before in the past. So, not going to fade it based on the market being 'overbought'.