There are 159 sleeps (159 days) until March 31 (Wednesday, March 31, 2027).
There are 159 days until March 31 (Wednesday, March 31, 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 March 31. Sleeps are the same as days.
159 sleeps is 22 weeks and 5 sleeps.