DD was similar when first going into a bed, once the novelty wore off she started being alot better, altho now she is back to getting in and out, doing god knows what, we hear thumping but when we get up there she is back in.
Now we've set ground rules, she takes one toy to bed and books she can sit in bed read her books play with the toy til she is tired and only get out of bed if she needs to use the toliet. This seems to be working well.