Non-Consecutive Night is a role modifier that restricts a power role from using its ability two nights in a row. Although this is an effective way of reducing the power and influence of a role in a game, X-Shot and Even/Odd Night restrictions are typically more common.
Non-Consecutive Night Commuters or Doctors are the most common roles associated with this modifier, but it's certainly possible for it to be applied to others.
This role modifier is considered Normal on mafiascum.net. It should only be used on active abilities. If a Non-Consecutive Night role is blocked, it still cannot be used the following night.