Sayani Ekadasi occurs on the dark fortnight of the tamil month
Aadi (Jul-Aug).
Lord Maha Vishnu after taking Vamana Avatar and destroying King Maha Bali, went into sleep in the ocean during this month. Hence this Ekadesi is known as Sayani Ekadesi.
The Lord remained in this Sayana state for the next four months and woke up in the Tamil month of Karthigai (Nov-Dec). These four months are also known as Chatur masyam.
It is believed that observing this Ekadesi will bring about Happiness.
Ekadasi Index