I was wondering if anyone has any input as to how lighting affects BPs.

I have my 2 BPs in a small rack facing towards the window in my room. Ever since I got back from vacation, my sleeping schedule changed greatly (before i used to stay up late, so there's light for 3-4 hrs more). Ever since I got back, one of them isn't feeding. The set up has been the same, and the other BP is feeding great as usual.

So now, I think my change in sleeping schedule messed her up in some ways.

Today I nailed a piece of black cloth in the front of the rack so that it blocks most of the light at night to see if it improves the situation.

my question is, has anyone done this? and how does it affect their feeding response?