Im having the same issue with dd3.... I have tried aldi, baby love, snugglers and huggies.... maybe some other brands too! Shes 7 months old and 8kgs. Her nappies leak up the back and some nightsh she is wet up to the under arm and through to her sheets.... however the nappy is not full. Every night I go through the same process, checking and double checking that the nappy is on properly. She continues to leak through the huggies at night on most nights. I put a wollen pilcher that I got from Big W for about $5 or so and that works most of the time, although she has wet through it a few times. I did put a larger nappy over the smaller one and that worked.... I really should try that again. I too wonder if she would sleep longer if she wasnt wet through. I hope you find some help. I know exactly how you feel. This morning I had to strip her as she was soaking and it just wakes her right up and to be honest.... I dont want her wide awake at 3am!