If you attain the state of wakeful sleep which is the same as samadhi, while still awake, doubts will not arise.

Devotee:  “I have an impression that in deep sleep I have something akin to samadhi. Is it so?”

Ramana Maharishi:   It is the waking ‘I’ that asks the questions - not the ‘I’ in sleep. If you attain the state of wakeful sleep which is the same as samadhi, while still awake, doubts will not arise.