Common steps and sub-activities
Long distance kayaking
One way in which people suffer from sleep deprivation coupled with exhaustion – both mental and physical is through long distance kayaking – paddling huge distances with very little rest.
There are a number of other factors working in the case of anyone at sea – storms provide stimulation via resonance, often the person is dehydrated leading to hypoxia, there is sensory deprivation at a major level, there is the enormous fatigue associated with the effort required, there is also very often forms of malnourishment.
So I could have picked any one of these as the main heading for the long distance kayaker, but it is clear that the really severe hallucinations or intense spiritual experiences only start when the person is totally exhausted from the amount of frenetic activity needed to keep going.