Sarah's bad habit

Aiyoh, my darling baby sister is a real mah fan. Everyday my mummy got to sing hymns to Sarah inorder to make her sleep... If mummy's voice good never mind, but hor her voice is really awlful leh. Haizzzz, poor me got to endure the noise population cause by mummy... I wonder when will she be able to sleep on her own without mummy singing???