Go to Search area in the taskbar and type taskschd.msc. Click on the Task Scheduler in the Best Match area of the context menu.
Expand the window. Not the Active Tasks detail pane in the lower middle of the screen. Double-click each and it will open that task in the console tree. Check the Triggers and Actions of that task. Change the time when they run or cannot run.
For example, my QueueReporting Task has a trigger that runs “At 11:27 AM at7/23/2018 - After triggered, repeat every half hour.”
Well, I don't need it to do that and don't remember what I was doing on that date but I don't want to run every half hour so I disabled that. So now it doesn't run except after system startup. If I wanted to I could also just turn off completely by disabling all the triggers.
In your case, just disable those tasks you don't need or any that run at 1300 every day or change the time to say 0200.
BTW, since I mentioned the msc shortcut for Task Scheduler, here is a list of all the msc shortcuts (click here) .
Not the Active should be NOTE the Active...
fireman15, Alas Babylon! has some helpful tips at #76.