Today I was having a dream, and became lucid slightly.. Here is what happened..

In my dream my little sister died and I was really depressed...She was buried beside my bed(hey,I was dreaming)Well when I went to sleep that night I had a dream about my sister and realized she was dead so I became lucid, walked around a bit and woke up in the same dream bed I fell asleep in.Then I tried all the reality checks, and they failed one after another... Then I woke up later and felt really really supid that I didn't realize it.... Anyone else had this problem?