There are 53 sleeps (53 days) until December 15 (Tuesday, December 15, 2026).
There are 53 days until December 15 (Tuesday, December 15, 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 December 15. Sleeps are the same as days.
53 sleeps is 7 weeks and 4 sleeps.