Babies tend to fall asleep in baby carriers when they feel comfortable and relaxed.
You may let your baby sleep in the carrier, but make sure that your baby's face is always visible and that her airways are clear, with the her chin off chest.
However, with the Cococho baby carrier, there's another unique way to keep your baby safe and asleep- You can off-load your baby and keep her fastened in the carrier. The carrier would keep your baby held, a bit like with wrapping, and would help keeping her asleep while she is lying on her back. When doing so, put your baby in a safe place (e.g., a crib) and always under attention.