Ears draining

So, I went to an ENT today because I've been having some sinus issues, and mentioned that my ears have been draining at night... like, to the point that it wakes me up sometimes (I roll over, my ear starts draining and I can't stand it). He said that my ears are totally clear and most likely it's - get this - sweat!

Oh, the joys of mid-40s... I've been sweating periodically at night, like to the point of soaking my pjs, and apparently my ears are joining in the game!

Has this happened to you? I had no idea.