All right, we know what Cassandra and Nicholas were up to and why they were up so late. Roger at least HAD gone to bed and came downstairs in his night clothes. And, Vicki was actually in bed, and so was dressed appropriately.
Then, Cassandra goes to Barnabas. We know this is already a good bit past 2 a.m. He's no longer a vampire. Yet he's there in his house dressed in a suit after 2 a.m.??
AND, Vicki runs to get Julia (one would assume from HER room) and SHE comes in FULLY DRESSED!!!!
I found it rather amusing that after persisting in calling "Cassandra" "Angelique" all of this time, when she finally admits that she's Angelique, the next time he calls her Cassandra!! Loved the whole scene between them. (But, again, where did she get the gun? Nicholas took her powers away; Roger shows up and has a confrontation with her. She gets away from him, runs to the Old House and is suddenly hiding a gun!
Back to yesterday - I always wondered about the scene when Julia insists that Barnabas must have been buried alive and gets Stokes to help dig up the coffin. She persuades him to do all of this and to leave her alone with the promise that the next day she will explain. So, the time finally comes for explanations - he only asks about the Adam suffocation part, not the Barnabas buried alive part (although he does question the rushed, secret burial) - and she manages to evade all the questions!! I could never get over how she could get out of that one. He reveals some of what he knows; one has to wonder if he's guessed the rest (the burial part would seem to be a pretty big clue for him).
Even Roger seems to be making a connection between the portrait and Cassandra. Yet the blond hair seems to have thrown everyone off. MINOR SPOILER
In a later story when she comes back as blond Angelique, she worries that members of the family will recognize her, and while they seem to note some familiarity, they don't.