West Texas Intermediate futures for February delivery fell to $37.73 (-0.97%), while Brent crude declined to $37.74 (-0.40%). Analysts say that the WTI's newly gained premium over Brent is the most important factor in the market these days, when trading is thin due to holidays. This week is going to be shorter due to New Year too with markets in many countries still closed for Christmas. This week will not be data-rich, that's why the Energy Information Administration's inventories report due on Wednesday will attract more attention.