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This is really common in the winter on cars that don't warm up to operating temperature for long enough. Normally, a small amount of condensed water from the air gets into the oil but when it's at operating temp for enough time, the water evaporates out and leaves through a one way valve. In this case, the water has emulsified with the oil and formed a thin mixture at the top of your engine. The cure is to go for a long drive, let your engine oil heat up to 95C for 30+ minutes and do this enough times for that sludge to disappear.
An oil change wouldn't hurt either, but the problem isn't with the engine or the oil-- it's with your driving distance. Make it a habit to take the car out for a long drive every week or two.
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