TMI but need some help!

Every time I go to bed with a pad on it always seems to leak by the time I wake up. Even if its light there will be a bit on the sides of my undies or legs and lately its been heavy since I just stopped the pill and only just got it back, and this morning it leaked all on my undies and the pad was soaked. It was a night time one too. I dont want to wake up in the middle of the night to change it either!