My 3yr old (just turned 3) hasnt had a day sleep in 6mth - much to my dismay.
She was mucking around at bedtime turning the lights on and off like a disco and constantly coming out of her room.
Our solutions, plastic child cover on her door knob do she can't just come out of her room when she wants - we can easily hear her if she calls out for us.
DH took out her light bulb to stop to midnight disco parties. We have since put it back and she doesn't do it anymore