There are 250 sleeps (250 days) until June 30 (Wednesday, June 30, 2027).
There are 250 days until June 30 (Wednesday, June 30, 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 June 30. Sleeps are the same as days.
250 sleeps is 35 weeks and 5 sleeps.