There are 335 sleeps (335 days) until September 23 (Thursday, September 23, 2027).
There are 335 days until September 23 (Thursday, September 23, 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 23. Sleeps are the same as days.
335 sleeps is 47 weeks and 6 sleeps.