Can't remote access into my home PC (laptop) when it's asleep

Just a quick question.  For years, I have been using TeamViewer from my work PC to remote into my home PC (which is a Windows desktop).

I am now getting rid of my old desktop and purchased a windows laptop for use at home.

My question is, when I close my laptop, it essentially goes to "sleep".  When that happens, I cannot remote into it from my work PC.  Is that the way it's supposed to work?  Do I have to keep my home laptop not just ON, but also OPEN (meaning "awake") in order to be able to remote into it?  I guess I'm just not used to this because my desktop was either on or off - never asleep, so I never had this issue.