Agree with previous poster that the Servisair Lounge is a bit of a hole, and sorry I can't help with the original question as on the occasion I've used it, access has been pre-purchased.

IMHO, the *A lounge isn't that nice either. Why not have a look in the "Itineraries" section and see if anyone will guest you into the BD lounge? They've got some comfy chairs in there which would be good to catch a quick nap and from my experience, it's a less hectic space than the *A.

Mark