Dear Leo,
Mommy thinks your newfound applauding ability is super fantastic. She's so delighted that you're finally giving her the recognition and reward she feels she deserves after 8 months of entertaining you.
However, there are preferred applause times that you need to be aware of. 3:30 am is most certainly not one of them. Perhaps you got confused because Mommy wanted you to show Aunty I your clapping at 3 in the afternoon. She wondered why you were holding out.