Nappy falling down in night

[vikihill1]

Hi all, my little one is currently in size 3 nappies (moved onto these about 3 weeks ago).
Has been absolutely fine in them until a few nights ago they fell down in his sleep (it had only been 3 hours since I put it on) and now every night they do the same thing so I have to change him more regularly than I do during the day!
Any suggestions as to what may help this, I've tried a few different brands and they all do it.. Any suggestions would be greatly appreciated!

Might it be worth popping him in a 2 for nights? There's always those few pounds of overlap so it might be that where overnight he stretches out/wriggles they're proving a bit big.

Thanks but Size 2s are far too small- they don't hold anything in and leave marks on him.

What brand are you using OP?

Currently Aldis., but we've tried pampers, Sainsbury's and Tescos.
Last night was better so hopefully it's just his shape changing!

What is he wearing on top of the nappy? A popper vest might help hold the nappy on more securely, if he's not wearing one already!

Cloth nappies?

They are fantastic and definitely won't move at night