This question is pretty broad!! However, I do have some general actions/tips for you. I've used most of them and I sleep very well... not that I am super productive, haha...
Practice conscious living instead of just productive living:
In any case, you'll need to develop a conscious sense during the day. You may have achieved more than you think, and sometimes we tend to hang onto minor negative thoughts, overlooking the good things happening every day.
In order to gain/regain that consciousness, every night keep a record of what you did. Now, I am not talking about "writing 3 things you feel thankful stuff," I just started with writing down only 5 things I did that day. It can be as silly as "I had pizza for lunch." The point is to write down the first 5 activities that came to your mind. Do this for one week.
Now, into the 2nd week, keep the same activity. In addition, assign some pluses to each of them to indicate how happy/unhappy that activity made you feel. The scale is relative and does not have to be scientifically precise... just + for very bad and +++++ for nothing better you can ask for. Do this for another week.
By week three, there is no instruction... because by this week, you'd actually want to write a lot more about everything. Your opinions, your thoughts, your feeling. Once you have a steady record of your activities and your moods, you will have a much better navigation map for your self-improvement. A lot of people are productive without a meaning, it's better to practice both consciousness and productivity.
Redefine what is productive:
Most of the time we set our productivity goal too high or too abrupt. A book that I found very helpful is Zen to Done by Leo Babauta. The key point of the book is to set three and only three things to achieve every day. You get to keep your productivity flowing without burning out.
I do believe being productive is important, but it should not be the sole source of happiness and worry of yours. Chatting with/calling a friend or family member to catch up, making and eating a nice healthy meal, even writing a reflection on why you're not being productive... are not necessarily about being productive but are also crucial to you well-being. This again brings us back to practice conscious living. Are you using every minute with a purpose?