No, you do not have to shut down your computer every single night. Sleep mode is fine for many people.
Should you shut down your computer every night?
TL;DR
Not always. Sleep mode is usually fine, but restarting regularly helps updates and performance.
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If you use your computer every day, sleep mode is convenient and saves time. Modern computers are designed for it.
Restarting is still useful because it clears temporary issues and completes updates. If the computer feels slow or strange, restart it.
Shut it down fully if you will not use it for a while, during storms, or before moving a desktop setup.
You do not need a nightly shutdown ritual, but do not go forever without restarting either.
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