I am sorry but I do not agree with you that you can recite chandi ki vaar at night and sleep , as my dad's sister's husband has been through the process of it once in his life , which was very dangerous and scary as he commited the same mistake . And if you do not believe me then you may try .
I have had people who have this Bani in their daily nitnem read it at night with no ill effects. It depends on your own kamayee - so yes best not to take the risk
+1 answer in: “is it true if u do chandi di vaar at night and then go to sleep, shaheed singhs will come and beat u up?”