my macbook air m1 crash when in sleep mode

Hello, haibincheung.

Thank you for posting in the Apple Support Communities and asking about your Mac shutting down unexpectedly in sleep.

1. Please start by checking the troubleshooting provided in this help article: If your Mac restarted because of a problem - Apple Support

Even if you are not receiving any alert or error messages, there are many great troubleshooting steps within this article that apply to your situation, and can help isolate the problem between software and hardware.

2. You can also check this article for hardware diagnostics and more troubleshooting: Use Apple Diagnostics to test your Mac - Apple Support

3. Since this occurs with sleep/wake, please check this article for more troubleshooting steps: If your Mac won't go to or stay in sleep  - Apple Support

Have a great day!