The hypnagogic sensations of falling or floating are most likely to occur during which sleep stage?

Between the rapid eye movement sleep - REM and wakefulness

Explanation:

Sensations of falling or floating are the most likely to occur during the period between wakefulness and the REM. This is known as a hallucinations that happen in our sleep stage.

REM - represents a stage of sleep where the eyes move most rapidly and our brain cells work at a rate almost the same as speed when we are awake.

The sensation of hypnagogic hallucination lasts up to a few minutes at maximum and is a state of double mind.