There are 320 sleeps (320 days) until September 8 (Wednesday, September 8, 2027).
There are 320 days until September 8 (Wednesday, September 8, 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 September 8. Sleeps are the same as days.
320 sleeps is 45 weeks and 5 sleeps.