There are 341 sleeps (341 days) until September 29 (Wednesday, September 29, 2027).
There are 341 days until September 29 (Wednesday, September 29, 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 29. Sleeps are the same as days.
341 sleeps is 48 weeks and 5 sleeps.