svapna nidra jnana alambanam vaYoga Sutras of Patanjali, 1.38
Or (samadhi can be realised) on the foundation of knowledge from dreams or sleep.
svapna = dreams
nidra = sleep
jnana = knowledge
alambanam = foundation
va = or
Sleeping babies (or anyone in deep sleep for that matter) seem to be in an ecstatic perfect peace, taking us there for a moment when we look at them.
It’s something we all know because we’ve been there too.
As for dreams, maybe this is about the kind of dreams that seem particularly insightful or meaningful to us, and that if we pay attention to them and align with their meaning, it can help us to be content.