There are 70 sleeps (70 days) until January 1 (Friday, January 1, 2027).
There are 70 days until January 1 (Friday, January 1, 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 1. Sleeps are the same as days.
70 sleeps is 10 weeks.