to Realize

I read Kunihiko Takeda's blog and found good suggestion from his experience.
He had been suffered from insomnia for a long time and more worse he had lost his eyesight caused by detachment of retina ten years before. After the operation, he was given prescription to fall asleep and it was successful for a while.
But it brought him side effect to harm his heart beating at last.
He had to give up taking the sleeping pill which he could sleep well and give him energy for the next day.
He realized not to worry any more for insomnia nor working well for tomorrow.
He just took it for granted as his life and destiny, so made up his mind taking it easy even if he couldn't sleep, instead he laid on the bed doing something such as reading, listening and so on.
Since he made it done without worry, he could rest well and gradually getting to sleep.
Then he concluded that he gave up to sleep well but realized not to worry in the future...in my opinion.