system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why depression/anxiety often get worse at evening and night?

**Edit:** I think the question can be more precise like

"Why one's mood often get worse and feeling down/anxious at evening and night?"

Not necessarily related with diagnosed mental disorders.
gpt
Because you are thinking about everything that happened today or could happen tomorrow right before bed.  You are alone with your thoughts.  With anxiety we all know it gets worse when you sit there and stew on things over and over again.