Is it normal to sleep over 12 hours?

I am a very heavy dreamer, I basically astral project which is probably why I stay asleep so long. On days that I'm dreaming normally, I still sleep literally forever. Today I slept for 15 hours and honestly if it wasn't for my noisy family I think I could sleep a whole 24 hours, I'm not even kidding. For some strange reason when I wake up I can almost ALWAYS immediately knock right back out for another 3-4 hours! Is this normal? Does anyone else sleep as much as I do?