There are 59 sleeps (59 days) until December 21 (Monday, December 21, 2026).
There are 59 days until December 21 (Monday, December 21, 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 21. Sleeps are the same as days.
59 sleeps is 8 weeks and 3 sleeps.