Diaper recommendation for a toddler who pees like a camel every night

We recently started “sleep training” to get my 18 month old to sleep in her own toddler bed. She often sleeps on her belly and the pee leaks out every night through her pjs.

We have a pee pad and use sposie style pads but it’s not enough.

What is the most absorbant diaper you’ve ever used?