Medicines do not help my father sleep, they make him more agitated and awake. We have seen Neurologists and Psychiatrists, he doesn't sleep. What can we do?

Does he have Alzheimer's? This is normal (sadly for the caregiver). Other than quiet moods, not letting him sleep during the day, maybe music or a bath if he'll let you, there isn't a lot you can change. You could try a sleep specialist. Many medications have unpredictable effects on older people, so it may be a case of just trying one thing and then another.

Some natural things work, such as melatonin, but check with the doctor first. Same with the herb Valerian.
Good luck,
Carol