There are 171 sleeps (171 days) until April 12 (Monday, April 12, 2027).
There are 171 days until April 12 (Monday, April 12, 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 April 12. Sleeps are the same as days.
171 sleeps is 24 weeks and 3 sleeps.