Musical beds

The little boys were so wound up tonight, that even by 9:30 they were still jumping in their beds and banging the walls and giggling and yelling. Even after me snuggling Sam and singing. Even after 3 rounds of Scout's night time songs.
So I took Tim out and put him to bed in the pack n play in the guest room, where he has his naps. He went right to sleep. I cleaned up the kitchen, sat down and watched a couple of tv shows.
About 11:30, I started getting ready to go to bed. This included (tonight) taking the trash to the curb. So I went upstairs to grab the bathroom trash and found a blaze of light. Sam had turned on his light, played a little, got bored, climbed over the closed baby gate (vertical metal bars, not super easy, though if you're part monkey...), and opened josh's door, turned on the light, pulled out several toys, played awhile (I infer, from observation), then got his pillow and curled up with Josh. All lights still on.
I don't even know what to say. I can't cut out naps, b/c he's so tired and grumpy at nap time, he falls asleep in 2 min! I've tried spanking, cuddling, sitting outside the door and putting him back in bed every time (this technique worked with J at this stage). I even taped over his light switch, since he turns on the overhead every time. It didn't work, obviously. Any suggestions??