What should i do if i have a hard coughs all the time and u can't sleep and i do not have ashma?

Cough: Cough can be a very complex process -- it can result from post-nasal drip, allergies, viruses, bacterial infections, reflux, or cough-variant asthma (to name a few) -- see your doctor for an exam and full workup.

See a doctor: A cough at night could be acid reflux, chronic sinusitis, allergies, and/or asthma. You should be seen by your primary care doctor for a complete evaluation.