As per Hinduism, Alasya arises out of some particular cause and disappears as and when the cause is removed. Such types of bhavas displace the sthayibhavas (steady states of mind). It is one of the auxiliary states of mind (vyabhicharibhavas)
Without one of the auxiliary states of mind, the process of rasa nishpatti (the manifestation of rasa) is not complete. Alasya is an auxiliary state of mind that intensifies any of the eight bhavas. For instance, the sentiments of hasya (humor) and karuna (pathos).
Alasya is aversion to any kind of work. Tiredness, inertness and yawning are the main manifestations of alasya. According to Dhananjaya and Dhanika (author of Dasarupaka), alasya exists as part of one’s nature, or due to illness, tiredness or excessive eating.
Alasya is displayed through the vibhavas (determinants), that is the actor and his actions – sorrow, walking, pregnancy in the case of women, and also in ordinary persons. It is to be represented on stage through anubhavas (consequents) such as distaste towards all types of activities, sitting quietly, lying down, drowsiness, falling asleep, etc.