What Causes Frequent Urination At Night?

Hi doctor,recently I have experienced on and off spurts of frequent urination especially at night.For a few hours,I would feel the urge to pee frequently and sometimes little pee comes out and sometimes the amount of pee is larger but not a huge amount.Than,this symptom could stop for two days then come back suddenly at a random time.my pee is clear and there s no smell to it.I don t feel any burning sensation when I pee.I have gotten a blood test recently and the results were normal.could this be due to stress or something serious like diabetes.