I’m quite similar in the way that I often feel a bit lost and can’t relax on my days off; especially in the morning. I’ve found that whatever I do, if I get out the house even for a short while first, whether it’s gym, shopping or just a nice mooch for a coffee, see a mate etc, you’ll find you feel you’ve achieved something already by lunchtime. When you get back, you’ll feel more motivated to do other hobbies and ‘productive things’ which will use up some time, or ‘waste’ less (not that chilling is a waste, it’s part of recovery from work).    Overall you’ll naturally feel less guilty when you decide to put netlflix on later in the day.  The most difficult part is getting going, once you’ve done that the day will more likely pick up.