The Kirtan Sohila Bani from Sri Guru Granth Sahib ji is the bani that is recited before sleeping. We die a temporary death every night and are with God in our deep sleep. For any ceremony, when the invitation cards are sent, the date is mentioned. The Kirtan Sohila Bani mentions that that invitation is sent to every house(which means the death to physical body is going to happen for every body) and it is a reminder to do the needful(what will be helpful to that person) before it's time to leave. It is mentioned there-
Sambat saahaa likhia mil kar paavo tel
The Samvat year(bikrami samvat) and the breaths are written on that invitation. I don't think it is written for that night only because in that case the year would need not be mentioned. So it is both the samvat year and number of breaths written for each person.
