There are 84 sleeps (84 days) until January 15 (Friday, January 15, 2027).
There are 84 days until January 15 (Friday, January 15, 2027) — 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 January 15. Sleeps are the same as days.
84 sleeps is 12 weeks.