those who have reached a stage where they can sleep and dream sweetly under any circumstances

आत्माधीनशरीराणां स्वपदां निद्रया स्वया। 

कदन्नमपि मर्त्यानां अमृतत्वाय कल्पते॥ 

इन्दिश्चे स्प्रुचे ३६९६ शार्ङ्गधर पद्धति

ātmādhīnaśarīrāṇāṁ svapadāṁ nidrayā svayā| 

kadannamapi martyānāṁ amṛtatvāya kalpate|| 

indiśce spruce 3696 śārṅgadhara paddhati

For persons whose body is in absolute control of their inner core, and those who have reached a stage where they can sleep and dream sweetly under any circumstances, even very little a even without any nutrition would give the benefit of amrtuham or ambrosia itself and sustain them .