A rest period is a time of relaxation or inactivity, usually in the form of sleep, a BREAK, DOWNTIME, a NAP, or a PAUSE. Sleep, with five letters, is a period of unconsciousness from which one awakens feeling refreshed. BREAK, also with five letters, is a PAUSE in activity for a short period of time. DOWNTIME, with eight letters, is a period of inactivity or idleness. Sunday, with six letters, is a day of rest and worship in many religions. NAP, with three letters, is a short period of sleep, usually during the day. PAUSE, with five letters, is a temporary stop in activity.