Hey dear, first of all, you know your baby the best and nobody can do better than a mother. So do not think this way at all. A mother knows what best for the baby.
Regarding crying in a night, it can be for various reason, may be baby is hungry, may be he peed, or this can be boz of colic, or wet diapers or clothes or may be it's hot. Check of these signs and when it's always better to have a sleep cycle. Dim the lights when the baby is sleeping, you can also play a quite song in the background.
Do not worry, it's very common. You are the best mother for your baby. Congratulations mummy :)