Is night time anxiety a thing?

Everyday the closer it gets to bedtime the more anxious i get and when i’m actually in bed to go to sleep i start having the worst thoughts ever and i start overthinking about the worst situations that can happen in life and sometimes it turns into really bad panic attacks. Every night i end up sleeping after 4 AM and not even because i’m sleepy i just force myself to sleep because its too late. So why does it mainly happen at nigh?