Should i shut down my Macbook Air M1 every night?

There is no power nap option in big sur and in M1 macbooks. You can see the screenshot.

more over, macbooks with m1 processor, do drain battery even if they are SHUT DOWN. Why? i have no idea, but it seems the case as a properly turned off macbook air m1 will drain 3-4% battery in 24 hours, which is not the case in older macbooks.

Just letting it sleep doesn't impact the battery. I rarely shut my MacBook Pro down and did the same with previous Mac laptops. If the battery is 100% at night it is 100% in the morning. I have Apple menu > System Preferences > Battery > Battery(in the side bar) > "Enable Power Nap while on battery power" turned off.

The following previous discussion may be of interest: https://discussions.apple.com/thread/252146579

Thanks -- I am surprised by both of those things.