I'm 17 and when I took my BP last night it was around 115-125/65-75. When I took it in the morning I got a 105/67 and a 109/66. Last night I had a big pop and some popcorn, dunno if that could've made it rise a little or not. What can I say is my real resting BP when someone asks? It's okay for my BP to go up like that, right?
Taking your readings a couple of times isn't really enough to get a decent average. Your morning readings were probably lower because you were rested and more relaxed. Your night time readings were probably higher because you weren't quite as relaxed after full day of whatever.
In either case, your numbers were excellent, you have nothing to worry about.