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When you use your MacBook for long periods, the apps and processes may clog up the computer’s RAM, lowering the system’s performance, especially as your Mac gets older and apps become more demanding. Why Do You Need to Restart or Shut Down Your MacBook? It will take more time to start up the computer and you’ll need to reopen all the apps you need. This helps clear all the memory from your computer.
Shutting your MacBook down ends all the running programs and applications and completely powers your Mac off. A MacBook in sleep mode will be instantly ready for work with all the applications and programs you were using previously after you open your MacBook’s lid and unlock the computer. You can power it back on by opening the lid or by pushing the power button. Putting your Mac to sleep is simply clicking on the Apple menu  and selecting Sleep, or as most people would do it, by closing your MacBook. It means that you reboot your Mac, so it starts “fresh.” This clears the computer’s memory by closing all the running programs. However, if you don’t want this to happen, you can deselect the option to reopen the windows when you log back into your Mac. You’ll then see a popup asking you to decide if you want your running app windows to reopen automatically when you log back in.
To log out of your Mac after using it, you’ll choose the Log Out option up in the Apple menu .