Both quality of nocturnal sleep and daytime arousal level in elderly people are ofter deteriorated and bright light has proven to affect them , Based on the concept of restorinl the normal circadian rhyth 皿 by bright light exposure , we introduce BRTGHT − CARE as a methot to improve their sleep − wake rhythm and effective results of BRIGHT − CARE in three elderlr care facilities . In addition , the terldency that it alleviated their sleep − wake disturbances , reduced their abnormal behavior and increased their eating a 皿 ount is