There are 148 sleeps (148 days) until March 20 (Saturday, March 20, 2027).
There are 148 days until March 20 (Saturday, March 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 March 20. Sleeps are the same as days.
148 sleeps is 21 weeks and 1 sleep.