How To Deal: Tinkling on the Bed

Brianna is at that age when she doesn't have to wear diapers anymore. I am one proud mom, hearing her say that she needs to peepee or do number 2 and go to the toilet instead of just doing it anywhere right when she feels it coming. But alongside this milestone is a problem...tinkling on the bed. So here's my question for the week:

How do you deal with kids tinkling on the bed in the middle of the night?

Not that Brianna does this every night but she does every once in a while even though I make her go before she sleeps. I want to end it altogether so I don't get all weepy over newly-changed sheets in the middle of the night.

So, do you have any tips for me, mommies?