What is the difference between....

I am learning bisaja and am wondering what the difference is between the two sentences.
"Matulog na ko"
and
"Motulog na ko"
I know that basically they mean "I'm going to slee now" but how exactly are MAtulog and MOtulog different?
Thank you!! 

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Salamat kaayu! by igoigo (not verified)
tog/tulog by litogo
Ma/Mo differences by litogo