DS has been sucking his thumb at night-time since he was a baby and with the help of that nasty-tasting nail biting Stop n Grow fluid thought he'd finally got over this - but the last 2 nights in a row I've found him sound asleep with his thumb stuck in! He genuinely doesn't realise he's doing it and is as anxious as I am now about it. Although we thought he had stopped he still has that nail stuff on at bedtime so obviously that isn't working anymore. Can anyone advise please?