There are 198 sleeps (198 days) until May 9 (Sunday, May 9, 2027).
There are 198 days until May 9 (Sunday, May 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 May 9. Sleeps are the same as days.
198 sleeps is 28 weeks and 2 sleeps.