I have heard it's easy to get leg leaks with overstuffed pockets. I have used fitteds or occasionally flats with wool covers ever since M was 4-5 months old and I've only had leaks like twice.
My favorite night solutions have been:
Outer/pocket:
Greenchild bamboo pocket fitted
Happy Hempy pocket fitted
Neat folded flat
Guerilla Fluff O2 fitted shell
Inserts:
Thirsties hemp prefold
Sherpa and/or hemp doublers
Padfolded flat or two in a pinch
Wool (sized up to cover all the fluff):
Woollybottoms soaker
Disana soaker
Loveybums interlock wool soaker
Sbish soaker (not really worth the money IMO)
I also use Woollybottoms footies as PJ pants. She's been wearing the same pair for MONTHS and they are only now starting to fit
Hth!!!
Edit: I have also used Bummis whisper pant pull on covers at night, they work great!