Forget complex philosophy for a moment. Consider the raw truth of deep sleep.
In Sushupti (Deep Sleep), the 'I' that thinks, plans, and dreams simply vanishes. There are no thoughts, no perceptions, no individual identity. Yet, upon waking, we affirm, "I slept peacefully." Who is this "I" that experienced peace in the absence of all content?
Vedanta states it unequivocally: This underlying, content-less awareness is the One Consciousness. It's the unchanging substratum (Brahman/Atman) that supports all three states of consciousness (waking, dreaming, deep sleep). Deep sleep isn't an empty void; it's the temporary retreat of the ego, revealing the ever-present, undivided Consciousness that you fundamentally are.
It's your daily, irrefutable proof that beyond the transient personality, there lies an eternal, unified reality. The very act of profound rest points directly to your true nature.
Image Credit: Pollinations