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The knocking noise you hear can only come from one thing and that is the evaporator gurgling. It will sound like 2 wood blocks hitting each other really hard repeatedly and it occurs when pressure builds up in the sealed system and refrigeration oil is covering the entry hole where the heat exchanger connects to the evaporator. Over time refrigeration oil can work it way from the compressor to the evaporator and that will cause a loud popping noise which sounds like 2 wood blocks hitting each other. Now the noise will occur fairly randomly and that fact that is occurs at 4am is likely due to the refrigerator coming on around that time each day since the door doesn't get opened through the night. Either way, the only way to really fix this issue is to replace the heat exchanger and evaporator which is rather expensive at about $600-800 or so. You can wrap the evaporator entry tube in an insulation and that will reduce the noise as well, but the noise will still be noticeable. It doesn't affect the performance of the unit, it's just an annoyance.
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