I am safe thank you wish you the same.The foreign body sensation like feeling in the throat is mainly because of the dryness that is in the throat and this could be because of less amounts of water consumption during the daytime. Ask at home to observe you when you are asleep to see whether you are breathing from your mouth.If yes then that is a nose block that is causing your mouth to be open during the sleep. Drink frequent sips of water during daytime do not swallow your saliva repeatedly to see if there is something stuck in the throat! If you still feel that something is there in your throat the visit an ENT for a video laryngoscopy.