There is a lounge attached to Sanaa and I have no idea how early they start serving drinks. I had a Cosmo with lunch there so I'm assuming the lounge is open.
I think it opens at 5:00pm.
Do they have a bar at the pool? I haven't stayed there since before Kidani. So I don't know.
It definitely opens before dinner service starts, unless something has changed recently. We've been in there for drinks in the late afternoon. I distinctly remember hearing the restaurant's little opening drum ceremony while on my second glass of wine.