I've been having a weird experience that last few mornings and I was wondering whether anyone maybe could help explain it.

Sometimes when I'm lying in bed, usually in the morning, I someimtes get lost in my thoughts. This happens a lot to me, even when I'm not trying to sleep but the odd thing is that when I'm in this state I'm aware of my body and my thoughts are nothing out of the ordinary. But if I get disturbed by something (like my dogs barking) I'll instantly forget what I was thinking about. It's like trying to remember a dream, the thought just seems gone but I know that I wasn't asleep and theres never any imagery assosiated with this state nor any sleep paralysis, vibrations or anything else except this strange amneisia.