There are 170 sleeps (170 days) until April 11 (Sunday, April 11, 2027).
There are 170 days until April 11 (Sunday, April 11, 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 11. Sleeps are the same as days.
170 sleeps is 24 weeks and 2 sleeps.