Bad cough once I hit bed?

Last week, it started with headache and bad soar throat...very little cold like symptoms. Then it became better, but I was coninuing to drink cold drinks and talkin louder.. Now I still cough. No fever or tiredness or anything. I have little phlegm. The problem is , last 2 days once I hit bed I start to cough so badly that I just cant sleep. Yest I hit bed at 12 but cant get sleep till 2. Day time I dont cough much. I havent taken any medicenes too..even over the counter. I just took couple of tylenol last week when I had slight fever. I have take some medicenes, but does this night time cough indicate anything . Later once I sleep I think I dont cough..(I dunno , as I am asleep.). Hellp me how to go abt this. Thanks. I dont want to spoil my sleep to night.