I use the same Laroche-Posay Redermic cream day & night.
What's the benefit of using a different cream for day and night? I have pretty oily skin and a lot of night creams are too heavy for me.
My skin is very dry so night creams are great for me
I use different creams at day and night to have different anti-aging ingredients working for me (I do the same with the serums and such as well) and because at night my skin really likes having more moisture to drink up. (The daytime cream I'm using right now doesn't have SPF, but I also do so to prevent using SPF at night because too much can irritate my skin, and I don't need sun protection while I'm sleeping...)
Right now I'm using Kiehl's Rosa Artica (usually use avacado at night). I switch just because I feel like I can do more moisturize at night and not look strange, so I think my eyes benefit from the extra.