Meditating Or Sleeping?

[carlos flores]

so I been meditating for the last couple of weeks and one thing I have noticed is that I feel like I "fade" and all the suddenly I hear my alarm telling me that my 30 minute meditation has ended. But when I meditate I feel like time flies and I feel like I get lost somewhere. I'm not sure if this is happening because i'm really concentrated or i'm falling sleep. It's really starting to annoy me. I'm not sure if i'm meditating or actually  sleeping. so what's going on? I been meditating since early July, so it's been only 3 months. any tips are also welcome!

[Deep]

Do you meditate with your eyes closed? If so, you might be falling asleep. If your eyes are open, you might be very good at it.