There are 180 sleeps (180 days) until April 21 (Wednesday, April 21, 2027).
There are 180 days until April 21 (Wednesday, April 21, 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 21. Sleeps are the same as days.
180 sleeps is 25 weeks and 5 sleeps.