Happens to me all the time, as recently as today. Came home from work at around 16:30 and my girlfriend had gone so I was home alone all day and night. I just didn't feel like playing any games.
Sometimes, for me, in periods like these it requires a new game or the re-discovery of an old classic to spark my interest and will for gaming in general again.
I have gone up to a couple of months without playing a single game and these bouts get more frequent as I grow older.
It's perfectly normal I believe, everyone gets a bit sick of their hobbies from time to time.