why do i feel like this? anything wrong in me?

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hi friends , for last couple of years i have this unique fear over darkness. i say its unique because i dont get scared of dark when people are around me. its the time when i stay alone in home or in any place. i get these wild thoughts of devils and other stuffs. and while i think of it if anything happens , like a door bell ring i get terrified to the core. i know its just these thoughts which runs inside scares me. am i normal friends? what should i do?? during these period il start praying and il be really restless. please suggest me some ways. im not like this before. during day time even if im alone no thoughts like this occurs nor when people are with me during night. its only the night time and that too when i stay alone.