The　effect　of　elevated　airflow　on　sleep　quality　was　investigated　with　18　elderly.　Three　airflow　conditions　were　set:　ceiling　fan/30　degrees　C/max.0.8　m/s　and　mean　0.7　m/s,　task　fan/30　degrees　C/max.0.8　m/s　and　mean　0.6　m/s,　and　thermally　neutral　/27　degrees　C/0.2　m/s.　Sleep　quality　was　evaluated　objectively　by　analysis　of　electroencephalogram　signals　that　were　continuously　monitored　during　the　sleeping　period.　Urinary　cortisol　concentrations　were　analyzed　to　measure　the　activity　of　sympathetic　nervous　system.　No　significant　difference　in　sleep　quality,　thermal　comfort,　or　cortisol　concentration　was　found　between　the　ceiling　fan　and　the　neutral　condition.　The　duration　of　total　sleep　time　decreased　by　35　minutes,　the　duration　of　REM　sleep　decreased　by　15　minutes,　and　the　cortisol　concentration　in　the　morning　increased　by　50　ng/mL　in　the　task　fan　than　the　other　two　conditions.　Compared　with　ceiling　fan,　less　heat　load　was　removed　in　the　task　fan　condition,　possibly　due　to　the　lower　air　speed.　This　study　shows　that　even　small　heat　load　led　to　reduced　sleep　quality　and　overactive　sympathetic　nervous　system　of　the　elderly.　By　supplying　an　airflow　of　0.8　m/s　evenly　over　the　human　body,　the　elderly　could　maintain　sleep　quality　and　thermal　comfort　at　an　air　temperature　that　was　3　K　higher　than　the　neutral　temperature.