A state of temporary disuse or suspension.
When discussing a notecard system for remembering things:
You don’t need to carry all the cards with you everywhere of course — the abeyance or future-oriented ones can stay in a stack on your desk.
Something is “in abeyance” or “held in abeyance” when there is no current assignment of ownership. A noble title is “in abeyance” when there is no one of the bloodline to claim it, for instance. By the same token, I suppose that consciousness is “in abeyance” while you’re asleep.