>>>>>So let sleeping dogs lie. (and yes, I know, a dog can't tell a lie, esp. when it's asleep). :-)
>>>>
>>>>And specially when you can't tell if it's actually sleeping or just pretending...
>>>
>>>So it might be lying about sleeping?
>>
>>Or just lying about, sleeping :).
>
>Is that "lying (lounging) about - sleeping" or "lying (telling untruths) about sleeping" ?

Yes. Spot the comma.