How can I use my Macbook as a remote keyboard for my iMac.

[Plazmotech]

Hi, I'm have this setup in my room, where my iMac is on my table, and I'm in bed with my Macbook. I often want to control my remote control my iMac, but I don't need the whole screen. That just lags and is useless, as I often watch movies. Also, I can see the screen perfectly. It is a waist of resources. Can I simply use my Macbook's keyboard and mouse to control my iMac? Thanks