1.10 abhava pratyaya alambana vrttih nidra
abhava: feeling of non-being, absence of awareness
pratyaya: going toward conviction, trust
alambana: support, abode, dependence on a prop
vrttih: function, condition, thought-wave
nidra: sleep without dreams
Sleep is the non-deliberate absence of thought-waves or knowledge.
In a dreamless sleep the consciousness is stilled without any effort.