Sharad Purnima is celebrated on the full moon day of the Ashvin month. According to Srimad Bhagvad, the famous Raas Lila of Lord Krishna with Radha took place on the night of Sharad Poornima. The moon is close to the earth on Sharad Purnima. Poha or puffed rice is prepared and keep in the moonlight on Sharad Purnima's night. There is a Ayurvedic reason behind this, During Sharad the days are warm and nights start to become cooler. This is perfect season for 'Pitta prakop' when pitta vitiates along with other two doshas. Consuming rice flakes with milk during night time is good remedy to pacify pitta.