I’ve been looking as well. Don’t think anything exists. West Seattle is pretty sleepy at those hours. Cupcake Royale/Verite Coffee used to be open till 10, but now they close at 8 due to the lack of night business. If something does exist I’d be glad to know!
Spana, you can always make yourself a thermos of your favorite hot beverage and park yourself (literally) outside any of the Seattle Public Libraries with their free wifi.
