Little visitor

Last night when I came home, my wife showed me a little visitor on my bonsai spruce forest. This bee was flying around for a long time on our balcony, seemingly looking for something. Then after careful consideration, it landed on this little spruce, attached itself with its "mouth" and begun cleaning itself with all six feet. When this was done, it went to sleep. I took a few photos of the bee. By the morning, it was gone.