Hi Connor,
This is Tamal trying to help you with the sleep issue.
The issue could be due to absence of some power/chipset/graphics related drivers in the system. Please update those either from Samsung support site (If you can locate driver downloads) or from Start>settings>windows update>advanced>optional updates> install any optional updates available there.
https://www.microsoft.com/en-us/p/samsung-updat... you can try their updater tool if already installed or downloading from store.