I would recommend you use the night pads from always and the ones that are for heavy periods. Also try to wear underwear that are one size smaller than what you usually wear so they fit a little tighter and when you move at night the pad won't move. I hope this helped you.
If you bleed heavily then it can be problem during night. You can use overnight pads which are of large size and specially made for night. You can also try double pad or you can use tampon and overnight pad together.
Get night time pads, try and sleep on your side, wear tighter undies and sleep with a pillow between your legs.
Wear two pairs of pants with your sanitary towel
You can just doucle the padding at night and diffidently wear tighter underwear so it keeps the blood from moving all over the place
Lying on your back also makes you more likely to leak in the night, try sleeping on your side?
Wear a high absorbansy pad or a tampon but you will have to get up to change that after about 5 hours
You can buy pads from cvs or riteaid so you can buy the really heavy ones so you want bleed