There are 209 sleeps (209 days) until May 20 (Thursday, May 20, 2027).
There are 209 days until May 20 (Thursday, May 20, 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 20. Sleeps are the same as days.
209 sleeps is 29 weeks and 6 sleeps.