5. A garment which is specifically for night use and one wears it at night-time is exempt from zizit, as zizit are not an obligation at night-time. Therefore one does not put zizit on sheets, cushions and blankets. However, if they are made from sheeps' wool, since one sometimes sleeps in them during the day it is correct to be stringent and make one corner rounded; if made from cotton, silk or goats' wool etc. there is no need to be stringent. (Ben Ish Chai Lech Lecha 17)
Note from us: Please consult your own rabbi to find out what to do - these are for learning purposes only.
As quoted from:
Shulchan HaMelech, a Kitzur Shulchan Aruch in 3 volumes as compiled by Maharan HaRav Shmuel Laniado z'al, 1923 with the supplement "Al HaShulchan" containing various opinions compiled by Ezra Basri, Chief Justice of the District Court, Jerusalem in 1992.
We would like to dedicate this learning for the speedy and complete recovery of two people: our friends' 5-year-old son, Joseph Benjamin, son of Ireneusz Khrystof, diagnosed in April with ALL leukemia, and a longtime friend of the family, Frank, son of Joseph, having thyroid surgery soon. Please have them in mind when studying. If you would like updates on their progress, please let me know so I can tell you when I find out from either or both.