There are 8 sleeps (8 days) until October 31 (Saturday, October 31, 2026).
There are 8 days until October 31 (Saturday, October 31, 2026) — one sleep per night.
One sleep per night between now and the big day — tonight is the first sleep, and the morning after the last sleep is October 31. Sleeps are the same as days.
8 sleeps is 1 week and 1 sleep.