Do you too sleep with your nose and mouth against your girlfriend's pussy, so that you are fed her smell continuously during your sleep, and so that, when you wake up, you can lick her awake?
I don't usually do that, but I have done it a couple of times in the past. I remember once with my ex-wife, we were on vacation somewhere, and I'd finished eating her out after she had a tremendous orgasm. We'd both had a little bit to drink, it was very late, so we both just fell asleep in the same position. Sometime several hours later I woke up. Her pussy was still right there by my mouth, so I just started licking again. Soon her body began quivering as she started cumming again. It was great. I loved it (so did she).