I can't stop coughing which is preventing me from sleeping. is there anything that would help?

Yes: You poor thing! trying to sleep with a cough is miserable. If you're coughing from an infection, try an otc cough suppressant or honey to quiet the cough. A vaporizer may help, sleeping propped up may reduce postnatal drainage, which makes you cough. Fever, body ache? Flu? Asthma? Pneumonia? Pertussis? Discuss with doctor if these measures don't help.