As everyone knows, stocks do not go up in a straight line, not even during the holidays. So although the future looks bright for U.S. equities as the major indexes continue to hit or challenge new highs, the market has been gasping for a breather to gather bullish conviction. My fear has been that we might not see it until January, which likely would have resulted in a more severe correction at that time. But falling oil prices and a weak Energy sector seems to have introduced a reason to sell this week. Read more about Sector Detector: Bulls revel in new highs and blue skies, but oil introduces a dark cloud