Windows needs to be restarted on a regular basis, and needs to be running during the night.
You should get into the habit of restarting your computer each evening and leaving it running overnight.
If you shut your computer down at the end of the day, it won't be able to do the scans and updates it needs to do during the night. The next morning when you turn it on, it will be slow and busy doing everything it should have done during the night.
Keep it running at night, so that it can spend time during the night doing this things, and not try to do them when you turn it on in the morning and sloe it down for a few hours.