Yes, you can leave a sleeping baby in a room. There are no laws against it and it is not considered neglect. However, there are some risks associated with doing so. The biggest risk is that the baby could wake up and cry, which could scare or startle the parents if they are not in the room. Additionally, if the baby is sick or there is something wrong with the crib or sleeping environment, leaving the baby alone could put them in danger. It is always best to err on the side of caution and check on your sleeping baby frequently to make sure they are safe and sound.