Try to keep in mind that you did take the time to have a meditation session, and the session successfully relaxed your mind and body so much that you fell asleep, which are both good things.
If it is early enough in the day, I would try to meditate again later on. But if it is already evening, I would be happy with the session as is and go ahead and get ready for bed.
If you continue to fall asleep during meditation, I would recommend finding a different time of day for your session when you are more alert, and make sure to meditate seated, not laying down.
Congratulations on sticking to your meditation habit! I hope this is helpful for you!