Never had any difficulties with the medics on this one — my normal resting pulse rate is 42 beats per minute.
A lower resting pulse rate than the norm — in relation to the general population — is common for highly conditioned individuals. If this is the case with you (it is with me, anyway), you shouldn't worry. Your flight surgeon should have asked you about this, by the way!
You haven't stated what specific abnormalities showed up on your ECG (EKG is falling out of use here in the US as well, BTW), but a low pulse in and of itself should not be regarded as an "abnormality".
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Anybody out after 2 AM is either a turd, a cop or a pilot. Or any combination of the three!