Well I used to live with a man who not only snored but also had sleep apnea. Have you tried getting him to roll over? I found that my ex wouldn't snore if he wasn't on his back. I one time rolled my ex right out of the bed trying to get him to STFP in the night.... it was that bad for me too. You can buy nose strips in the pharmacy for this kind of thing... not sure if you can in Costa Rica but maybe? Hand or pillow over his face? JK.
The mention on lice has me scratching already... been there done that with my kids... but until you know try not to get psychosomatic over it.
Otherwise I am pea green with envy that you an in Costa Rica!! Enjoy girl!