Refreshers are activities that help to restore energy and alertness. SIESTAS, which is a 7-letter word, is a short nap taken during the day, usually in the afternoon. Tonics, a 6-letter word, are drinks that are believed to have medicinal benefits and can be used to improve health or mood. NAPS, a 4-letter word, are short periods of sleep taken during the day, usually lasting for a few minutes or hours. All of these activities can be used as refreshers to help restore energy and alertness.