There are 259 sleeps (259 days) until July 9 (Friday, July 9, 2027).
There are 259 days until July 9 (Friday, July 9, 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 July 9. Sleeps are the same as days.
259 sleeps is 37 weeks.