A lot of lines will try to sell you both a day and night treatment kit. However, generally, I find this really unnecessary.
Instead, I have a few products I use all day/night and then one or two I use either morning or evening.
For example:
I use my firming serum and a little Marula oil during the day. If I go out, I apply sunscreen/makeup over it. It's a perfect base for this. I don't use any retinols, heavy treatment serums or creams.
At night, I cleanse/exfoliate and apply either my CAVI PLLA -or- a retinol. If I'm feeling dry, I let that product sink in for about 15 minutes and then dab on a little Marula oil.
I apply the light eye/lip serum both day and night.
That's it.
Don't be swayed into buying daytime cleansers and creams and potions and then another kit for the night. Yes, you need different types of products both day and night, but just buy the few key items for those times and then use your favorite oil/cream.
A word about retinols and other heavy treatment items...