loukas 2

When Hosios Loukas was frequented by pilgrims... 

or members of Saint Luke’s healing cult...

visitors would sleep not only in the Katholikon, but in the crypt itself where the tomb was kept along with two others, believed to be abbots. Saint Luke was believed to have been a miraculous healer, levitator, miraculous feeder and prophesier during his lifetime. After his death, all of the miracles associated with him involved the healing power of his tomb. 

Accounts in the Vita of St. Luke, written by an anonymous monk, indicate that 'healing agents' associated with the tomb include, but are not limited to, exposure to 'oil from the lamp above the tomb, moisture exuded from the tomb, and dreams experienced when sleeping near the tomb in the practice called incubation.' 

The tomb was frequented before and after the completion of the complex, but following completion it became the focal point of the miracle cult of Saint Luke. There is evidence that some wishing for miracles stayed for periods of up to six days near the tomb or in adjacent rooms. 

[wikipedia]