Restore Everyone's Sleep Tonight Act of 2021 or the REST Act of 20 21 This bill authorizes an airport to impose an access restriction between the hours of 10 p.m. and 7 a.m. for aircrafts. An airport may impose a noise deterrence penalty on an air carrier or aircraft operator for a violation of the access restriction. The restriction does not apply to the operation of military, law enforcement, and U.S. Coast Guard flights.