Potty Training

How did you get your little to go the whole night without wetting the bed. My daughter has been potty trained off and on since one. She is now 3 and just started using the potty consistently throughout the day, wearing underwear with no accidents. We put a diaper on her at night to avoid accidents in the night. Before bed though I usually have her use the potty twice right before bed, but she still goes once or twice in her sleep. Tips, tricks, experience??