Gabapentin and sleep

I Take gabapentin for anxiety and also my sleep sometimes. However, ever since I have been taking gabepentin I sleep for over 15 hours almost every day of the week. Just last night, I went to bed at 1 am and I just woke up right now at 5 o clock. This happens almost every day since being put on gabapentin. It’s making me so depressed. What can I do?? Do I just stop taking it at night?