I was semi awake when gastric reflux reared its ugly head & I wound up dribbling over the keyboard of the open MacBook Air as I tried to direct the effusion into a bucket beside the bed. Probably only a couple of teaspoons worth.
So the thin plastic keyboard protector I bought just under 12 months ago has saved the day. https://www.amazon.com/UPPERCASE-Premium-Keyboard-Protector-UPP-PKBC-A11/dp/B009HHY2TW/ref=sr11?ie=UTF8&qid=1510773752&sr=8-1&keywords=macbook+air+keyboard+cover+11+inch+uppercase