There are 147 sleeps (147 days) until March 19 (Friday, March 19, 2027).
There are 147 days until March 19 (Friday, March 19, 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 19. Sleeps are the same as days.
147 sleeps is 21 weeks.