2019 MacBook Pro battery draining in sleep mode

SMC reset may help, Also see if shutdown helps while not using for long periods / overnight.

How to reset the SMC of your Mac - Apple Support

About the SMC

The system management controller is responsible for managing behaviors related to these features:

• Power, including the power button and power to the USB ports
• Battery and charging
• Fans and other thermal-management features
• Indicators or sensors such as status indicator lights (sleep status, battery charging status, and others), the sudden motion sensor, the ambient light sensor, and keyboard backlighting
• Behavior when opening and closing the lid of a notebook computer

TheJBiz wrote:

My 2019 Macbook Pro recently started draining its battery while sleeping. I've been using the machine for over a year and this problem started in the last two weeks. The laptop heats up considerably as well. I'm not running any programs/downloads (that I'm aware of) that I wasn't running over the past year. Any thoughts on how to address the issue would be appreciated.

Verify you have Turned off (disable) Power Nap in both Battery/Power Adapter. Known to currently cause some issues. I can not speculate on your "last two weeks."

From >System Preferences>Battery

If you still have an issue you can always try reset the SMC https://support.apple.com/en-us/HT201295

(does not apply to the SoC M1 Macs)

Turn Power Nap on or off on Mac - Apple Support

What is Power Nap on Mac? - Apple Support