45 C.F.R. § 1302.31
(b) Effective teaching practices.
(1) Teaching practices must:
(2) For dual language learners, a program must recognize bilingualism and biliteracy as strengths and implement research-based teaching practices that support their development. These practices must:
(c) Learning environment. A program must ensure teachers implement well-organized learning environments with developmentally appropriate schedules, lesson plans, and indoor and outdoor learning experiences that provide adequate opportunities for choice, play, exploration, and experimentation among a variety of learning, sensory, and motor experiences and:
(e) Promoting learning through approaches to rest, meals, routines, and physical activity.