I've also been suffering from insomnia lately because I've been taking entecavir. I consulted my doctor, but most people don't experience insomnia, so he told me to adjust my medication schedule to take in the morning. He also advised me to pay attention to my diet. Are you drinking coffee? It's best not to, as it will only worsen insomnia. Eat a light diet; you could consider the Mediterranean diet, which may be helpful. I wish you increasingly better health, my friend.