Yeah it could be fun. The lich is ultimately just sitting and waiting for them cause he is looking to enter a higher plane through some funky magic but is tethered to the material plane because of their soul. He is literally using the party. This may throw a wrench in his plans a bit
I teach children this word at my job and it is fun identifying creatures by when they are most active. Many of the creatures we consider nocturnal at first glance are mostly or entirely crepuscular